Question

a 150 kg car engine develops 500 watts for each kg. what force does it exert on the car moving at a speed of 20m/s

Answer 1

Power= Work / TimePower = Force*Displacement / TimePower = Force*Velocity500 = Force*20Force = 500/20 = 25 Newton.I hope this answer is helpful to you

Answer 2

1 kilowatt = 1000 J s^-1

Total Power

= 150 × 500

= 7.5 × 10^4 W

${\implies Force = \dfrac{Power}{Velocity}}$

${\implies Force = \dfrac{7.5\times 10^{4}}{20}}$

= 3.75 × 10^3 N

Hence

Force = 3750 N