# What is the average power in accelerating this car

1. May 1, 2006

### Groovy_Duck

I was given this as a practice problem:

A 1,000 kg car accelerates from rest to 25.0 m/s in 7.50 s. What is the Average power?

So far, I know that P= FD/t F=ma
m=1000kg
initial velocity = 0
final velocity = 25.0 m/s
t = 7.50 s

how do I find the acceleration? thx

2. May 1, 2006

### Pengwuino

The acceleration is $$\frac{{dv}}{{dt}}$$, the change in velocity over the change in time

3. May 1, 2006

### Curious3141

You don't have to find the acceleration. Average power is (total work done over a time interval) divided by the time interval.

Total work done can be calculated by the change in kinetic energy of the car.