yo @agent0smith

Question

yo @agent0smith

yanasidlinskiy · Answer

A motorcycle is going 30m/s. If the brakes are applied and the motorcycle's acceleration is -3.0 m/s^2, how far does the motorcycle go in 4.0 seconds?
A. 120m
117m
108m
96m
88m

agent0smith · Answer

$$\large x = v_i t + \frac{ 1 }{2 }at^2 $$
vi = 30
a=-3
t=4
x=?

yanasidlinskiy · Answer

30(4)+1/2(-3)(4)^2
= 96?

yanasidlinskiy · Answer

You jump off a cliff into the water below. It takes 4.0 seconds to hit the water. How high is the cliff?
40
80
120
200
400

agent0smith · Answer

same formula as above, 

vi = 0
a=9.8
t=4

yanasidlinskiy · Answer

Umm I got 19.6??

agent0smith · Answer

Nope, write out the formula again like last time

yanasidlinskiy · Answer

Oh I didn't square it...

yanasidlinskiy · Answer

I'm getting 78.4

yanasidlinskiy · Answer

So 80m?

agent0smith · Answer

ugh you don't listen :P it's so much easier when you just write out your work. 

Yes but I'm not happy about it.

yanasidlinskiy · Answer

Lol I did write it out hahha I swear lol.

yanasidlinskiy · Answer

You gonna hate me now? Hahha
0(4)+1/2(9.8)(4)^2
=78.4
You gonna punish me now for not writing my work out teacher? LOL

agent0smith · Answer

it's cos it's far easier to check and i don't have to work it out myself :P you're the student,
 you do the work!