# Work done in time

1. Nov 14, 2009

### PepeF.

1. The problem statement, all variables and given/known data
a 1.83x10^3 kg car accelerates uniformly from rest to 13.6m/s in 2.81 s

-what is the work done on the car in this time inerval?

-what is the power delivered by the engine in thsi time interval?

2. Relevant equations

w=f*d
p=w/t

3. The attempt at a solution

i did the first one, but could not be able to come up with the answer
i multiplied gravity x mass = f then fxd=246568 and its wrong
can you please explain or tell me how to get it

2. Nov 15, 2009

### jdwood983

Because your acceleration is not gravity, it is the acceleration that is implied in the problem:

$$a=\frac{v_f-v_0}{t}=\frac{13.6m/s-0m/s}{2.81s}=4.84m/s^2$$