Power supplied to change the velocity of a car from 10 M per second to 5 M per second in 4 seconds is 100 watt. Find the work done if the mass of the car is 1000 kg. Find the kinetic energy before and after power is supplied to it?
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Answered by
16
work done is equal to 400 joules and kinetic energy before is 50 kilojoules and after is 12.5 kilojoules.
We know that,
work done = power x time
=> work done = 100 x 4 = 400 joules
kinetic energy = mv²/2
Hence kinetic energy before power application,
E₁ = 1000 x 10²/2
= 1000x 50
= 50 kilojoule
Kinetic energy after applying power,
E₂ = 1000 x 5²/2
= 500 x 25
=12500
= 12.5 kilojoules
Answered by
3
Work done = 400 joules
Kinetic E1 (before) = 50 kilojoule
Kinetic E2(after) = 12.5 kilojoule
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