Power supplied to change the velocity of a car from 10mpersec to 5mpersec in 4 sec is 100 watt.Find the work done. if the mass of the car is 1000kg.find the kinetic energy before and after the power is supplied to it.
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power = 100W
time = 4 sec
Work done = Pt = 100×4 = 400J
mass of car = 1000kg
KE (initial) = 1/2mv^2 = 1/2 × 1000 × 10^2 = 50000J
KE (final) = 1/2mv^2 = 1/2 × 1000 × 5^2 = 25000J
time = 4 sec
Work done = Pt = 100×4 = 400J
mass of car = 1000kg
KE (initial) = 1/2mv^2 = 1/2 × 1000 × 10^2 = 50000J
KE (final) = 1/2mv^2 = 1/2 × 1000 × 5^2 = 25000J
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