# The power of car engine is 500watt and mass of car is 1000Kg. Then How much time would engine take to change its momentum from  to

Chamge in kinetic energy is given as

where P is momentum and m is mass of the body

Initial Momentum P1 = 25000 kg m s-1

Final Momentum P2 = 4000 kg m s-1

Mass of car, m = 1000 kg

Power of engine, P = 500 W

Time taken is t

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