Posted by **Harmony** on Sunday, September 18, 2011 at 10:31pm.

A car initially moving at 15 m/s accelerates at 4.5 m/s2 over a distance of 10 m. Find the final velocity?

- Physics -
**drwls**, Monday, September 19, 2011 at 9:14am
Let the initial velocity be V1 = 15 m/s and the final velocity be V2 (unknown).

Since F = M a is the accelerating force and the work done is

W = F*X,

K.E. change = (M/2)[V2^2 - V1^2] = M*a*X

M cancels out.

V^2^2 - V1^2 = 2 a X

Solve for V2.

There is another way to derive the same equation without using the mass and force.

Travel time = T = X/(avg velocity)

T = 2X/(V1 +V2)

V2 -V1 = a*T = 2 a X/(V1 + V2)

V2^2 - V1^2 = 2 a X

- Physics -
**Fleance Mhlari**, Friday, April 5, 2013 at 12:16am
t=10m/15m.s

=2/3s.

V=u+a¤t

v=(15m/s)+(4.5m/s2)(2/3sec)

v=18m/s

## Answer this Question

## Related Questions

- physics - Car moving down road accelerates at uniform rate 2.8 m/s/s for 4.63 s ...
- physics - Two cars are initially moving at constant speeds of 50 m/s (first car...
- physics - 1) A boy sledding down a hill accelerates at 1.40 m/s, If he started ...
- physics ( please help me) - a railroad handcar is moving along striaght, ...
- Physics - Two cars cover the same distance in a straight line. Car A covers the...
- physics - Two cars cover the same distance in a straight line. Car A covers the ...
- physics - 1.A body with an initial velocity of 18km/hr accelerates uniformly at ...
- physics - A force of magnitude Fx acting in the x-direction on a 2.50-kg ...
- physics - the momentum of 900kg car initially moving north at 10m/s increases by...
- AP Physics - A 3kg object initially moving in the positive x-direction with a ...