A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s with negligible friction and air resistance. what is the average power delivered by the engine? (1 hp = 746 w)

Average power=89.8 hp

Explanation:

According to work energy theorem,

Work done = change in kinetic energy

W = 1/2 m Vf²-1/2 m Vi²

m = mass = 1500 Kg

Vi = initial velocity=0

Vf = final velocity = 25 m/s

w = 1/2 (15000 (25) ² - 1/2 (1500) (0) ²

W=468750 J

now power = work / time

P=468750/7

P=66964 W = 66964/746=89.8 hp

so P=89.8 hp