Question

A 1000kg car accelerates from 0 to 25m/s in 8s. What is the average power delivered by the engine? (1hp=746W)

P=W/t
p=Fd/t
P=Fv
p=mav
=1000(25/8)(25)
=78125W which is about 104.725 hp

Is this correct?

Answer 1

What is the change in KE ?
1/2 m v^2

divide by time, and you have power.