activitity title constant velocity speed
exercises Motion a line with constant velocity.
1. if a bus travels north with a constant velocity of 3 m/s what is the displacement after 15 seconds?

Question

activitity title> constant velocity speed 
exercises Motion a line with constant velocity.
1. if a bus travels north with a constant velocity of 3 m/s what is the displacement after 15 seconds?

anonymous · Answer

It is traveling 3 meters every second for 15 seconds.

$$\frac{3m}{\not s} \times 15\not s = (3\times 15)m = 45 m$$

anonymous · Answer

i got 1 - 6 question of my hw =)))))

anonymous · Answer

how can i get that ? no more conversion?

anonymous · Answer

hello sir what is displacement?

anonymous · Answer

Displacement is how far you are from where you started

anonymous · Answer

thank you sir

anonymous · Answer

do you want to help me?  i got 5 question here left =)

anonymous · Answer

Ok.

anonymous · Answer

activitity title> constant velocity speed 
exercises Motion a line with constant velocity.
1. if a bus travels north with a constant velocity of 3 m/s what is the displacement after 15 seconds?

2.greg is at the school gate, about 25 m on a straight line from the bleachers. The company commander is giving the countdown of 10 seconds for formation at the bleachers.With what velocity should grey run so that he can be in his designated position without being late?

3.A car moves at 60km/hr along a straight highway.how many seconds will it take for the car to travel a distance of 10 km?

4.if it takes 2 hours for a bus to travel 100 km along a straight highway what is its speed?

5.if a van travel 72 km on a straight expressway for 240 minutes,what is its speed?

6.a jeepney or a car at a constant speed of 40km/hr. how many minutes will it take for the jeepney to travel a distance 0f 80 km?

anonymous · Answer

hahaha

anonymous · Answer

exercises : motion along a line with a constant velocity

anonymous · Answer

So look at number 2 and see if you can figure out how to set it up the way I did the last one.

anonymous · Answer

How far does greg have to run?

anonymous · Answer

25m x 10sec ?

anonymous · Answer

Not quite. The answer you want is a speed right?

anonymous · Answer

25m

anonymous · Answer

$$Speed = \frac{Distance}{Time}$$

In the previous problem we used this fact to find Distance..

$$\implies Speed \times Time = Distance$$

anonymous · Answer

But for this problem, we are given a distance and a time, and need to find the speed.

anonymous · Answer

So to do that we just divide the distance by the time, and we get speed.

anonymous · Answer

thats the professor teach us im slow about that.. last subject your formula speed = distance and time your correct sir

anonymous · Answer

So if 

$$Speed = \frac{Distance}{Time}$$

And the time is 10s and the distance is 25m, what speed is needed?

anonymous · Answer

25m divide 10s right sir?

anonymous · Answer

Indeed

anonymous · Answer

2.5 m/s?

anonymous · Answer

Yep

anonymous · Answer

3.A car moves at 60km/hr along a straight highway.how many seconds will it take for the car to travel a distance of 10 km?


So again, we will use the fact that
$$Speed = \frac{Distance}{Time}$$

Where here we are trying to solve for the Time, and we have the speed and the distance.

anonymous · Answer

Can you solve it?

anonymous · Answer

sir i got a real question to you sir sorry for disturbing you.the proffesor quiz yesterday and he answer it.....

anonymous · Answer

can i put it?

anonymous · Answer

sure

anonymous · Answer

a<<< symbol like a with > in his head what is the a with ">" of a car that goes 20km/ hr to 30 km / hr in 2sec?

anonymous · Answer

i never thought he use conversion with that ...TT

anonymous · Answer

I think he means acceleration.

$$Acceleration = \frac{\text{Change in speed}}{\text{Change in time}}$$

anonymous · Answer

So if it goes from 20 to 30 km, what is the change in speed?

anonymous · Answer

yes sir acceleration sir

anonymous · Answer

Err 20km/s to 30km/s rather.

anonymous · Answer

the proffesors answer is 1.80x10 km /hr  <<<with small 4 in 10

anonymous · Answer

he use conversion of 2s x 1km divide 3600s we didnt know he do that

anonymous · Answer

Because you must have all your units be the same.

$$\text{Change in speed} = \frac{30km}{hr} - \frac{20km}{hr} = \frac{10km}{hr}$$

$$\text{Change in time} = 2s = 2s \times \frac{1min}{60s} \times \frac{1hr}{60min} = \frac{2}{3600}hr = \frac{1}{1800}hr$$

$$Acceleration = \frac{\frac{10km}{hr}}{\frac{1}{1800}hr} = 1.8\times 10^4 \frac{km}{hr^2}$$

anonymous · Answer

sir so the prof is correct? i thought the prof is lazy i knew it

anonymous · Answer

your answer is correct sir its written in my notebook

anonymous · Answer

lets go back to no.3 sir thank you sir

anonymous · Answer

So, you have the speed, and you have the distance, you have to solve for the time. Can you manage it?

anonymous · Answer

60 x 10 sir?

anonymous · Answer

$$Speed = \frac{Distance}{Time}$$$$\implies 60 = \frac{10}{Time}$$

Solve for Time.

anonymous · Answer

600

anonymous · Answer

No. If you are going 60km each hour it will not take you 600 hours to go 10km

anonymous · Answer

ops

anonymous · Answer

60 divide 10 = 6hr = 21600 sec?

anonymous · Answer

You are going 60 km each hour. Will it take more or less than 1 hour to go 10km?

anonymous · Answer

less hour 6mins?

anonymous · Answer

360 sec?

anonymous · Answer

$$60 = \frac{10}{Time}$$$$\implies \frac{60}{10} = \frac{1}{Time}$$$$\implies 6 = \frac{1}{Time}$$$$\implies Time = \frac{1}{6}hr = \frac{1}{6}{60}s = 10s$$

anonymous · Answer

thank you sir  i feel shy to disturb you maybe you answer 4,5,6 and u can rest and i can rest to TT

anonymous · Answer

i write your answer to my hw =)

anonymous · Answer

sir answer of no.4 50km/hr?

anonymous · Answer

waaaaaaaaaa