Question

I need help!!

Answer 1

A car with an initial velocity of 25 m/s [E] experiences an average acceleration of 2.5 m/s2 [W] for 2.0 ´ 101 s. At the end of this interval, the velocity is
a.
5.0 ´ 101 m/s [W]
b.
0.0 m/s
c.
25 m/s [W]
d.
75 m/s [W]
e.
75 m/s [E]

Answer 2

@agent0smith

Answer 3

how do we do this question I forget

Answer 4

Final velocity = initial velocity + accel * time

Keep in mind the directions.

Answer 5

oh

Answer 6

I get A

Answer 7

@FaiqRaees

Answer 8

for how many seconds does that acceleration lasts?

Answer 9

I got 5

Answer 10

Yeah I can't read the time either, so I can't check anything.

Answer 11

A car with an initial velocity of 25 m/s [E] experiences an average acceleration of 2.5 m/s^2 [W] for 2.0x10^1s. At the end of this interval, the velocity is

a.5.0x10^1 m/s [W]
b.0.0 m/s
c.25 m/s [W]
d.75 m/s [W]
e.75 m/s [E]

Answer 12

@agent0smith know you can see better thou

Answer 13

So... 20 seconds.

Just use

Final velocity = initial velocity + accel * time

And keep in mind the directions of velocity and acceleration. Make one negative.

Answer 14

I am having little trouble

Answer 15

@ParthKohli

Answer 16

@Astrophysics

Answer 17

@KendrickLamar2014

Answer 18

\[Final ~ velocity = Initial ~ velocity + Accel \times Time\]
1. What is the Initial Velocity?
2. What is the Acceleration?
3. What is the Time?

Answer 19

1. 25
2. 2.5
3. 2.00x10^1

Answer 20

Yes, now plug that in to get the answer.

Answer 21

LOL i am getting 550

Answer 22

vf= 25+2.5*2.00

Answer 23

\[25+(2.5)(2)(10^1)\]
\[=25+5(10^1)\]
\[=25+(5)(10)\]
\[=25+50\]
\[=75\]

Answer 24

The velocity and acceleration are in different directions. One of them needs to be negative.

Answer 25

yea the west side be negative then it be -2.5

Answer 26

I didnt know how to solve that part. @agent0smith thanks for that :)

Answer 27

It is C.

[West] = (-) direction
[East] = (+) direction

a avg=Δv/Δt=vf−vot
Plugging in given values:
−2.5=vf−25/20
vf= -25
Solving for vf will give me −25, which means 25 [West]
@agent0smith

Answer 28

agree?

Answer 29

Yes.