Calculating Average Power for a 1500kg Car Going from 0 to 90km/h in 5s

[bob24]

Homework Statement

A 1500kg car can go from zero to 90km/h in 5.0 seconds. What is the average power required to do this?

Homework Equations

I tried with P=Fv, I don't really know what else to use(

The Attempt at a Solution

First I converted the 90km/h to m/s and got 25m/s/
Then I did F=mg with m=1500 and g=9.81m/s^2
Then I used the equation P=Fv
P=Fv
P=14175 x 25m/s
P=354375W

ANSWER: 93750w OR 125.7 hp.

Any help would be greatly appreciated.
Thanks

 

[rl.bhat]

3. The attempt at a solution
First I converted the 90km/h to m/s and got 25m/s/

OK

Then I did F=mg with m=1500 and g=9.81m/s^2

You can't use g hare. Find the acceleration. And then the displacement.

 

[bob24]

3. The attempt at a solution
First I converted the 90km/h to m/s and got 25m/s/

OK

Then I did F=mg with m=1500 and g=9.81m/s^2

You can't use g hare. Find the acceleration. And then the displacement.

----
Ok I got acceleration=5m/s^2, and then I did Vf^2-Vi^2=2aS and got 62.5 meters for S.
So do I do
F=ma
F=1500 x 5
F=7500 N?

 

[rl.bhat]

Now average power =ForceX average velocity

 

[bob24]

Now average power =ForceX average velocity

Excellent. Thank you very much!