Question

A 150kg car engine develop 500w for each kg what force does it exert in moving a car at a speed of 20m/s

Answer 1

Total power (P) = 150×500W
=75000W
we know,
power (P)= force (F) × speed (v)
75000 = F×20
therefore, F= 75000/20 N
= 3750 N

Answer 2

Power = 500 watt

Power = Force × velocity

500 = Force × 20

Force = 25N for one kg

Force for 150kg = 25 × 150 = 3750N

Hope it helps!