Physics 11 Help: Solving for Power Output of a Car Accelerating to 80 km/h

[roxxyroxx]

Physics 11 help please?!?

Homework Statement

a 1 200 kg car accelerates uniformly along level ground from rest to a speed of 80 km/h in 10 s. what is the power output of th motor?

Homework Equations

eff=(mgh/f*d)x100%
p=f*v

The Attempt at a Solution

idk where 2 start...

 

[rock.freak667]

Seeing as how the car goes from rest to 80 km/h in 10 s, what is the acceleration produced by the car and hence the force produced by the car?

 

[roxxyroxx]

a=2.2m/s^2
so what formula do i use?

 

[NBAJam100]

Did you learn that P=W/t? where W=work and t=time?

About the a= 2.2m/s^2, i didnt check the number, but if you know the acceleration, and you know the mass. Then use F=ma

 

[roxxyroxx]

ok so F=2640N and W=F*d so what's d?

 

[rock.freak667]

Use the second equation you put in the relevant equations section.

 

[NBAJam100]

Yeah, you are making it harder on yourself if you use P=W/t, i was just bringing it up as another method to use at some point. You already know P=f*v and you have f and v