what will be the work done to increase the speed of a bike from 18km/h to 54km/h if the mass of car is 100 kg
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Work done by the car = 10000 J
The work done by the car will be equal to the change in the kinetic energy of the car.
Kinetic Energy = 1/2 mv²
Initial velocity = v1 = 18 Km/h = 5 m/s
Final velocity = v2 = 54 Km/h = 15 m/s
Initial kinetic energy = 1/2 mv1²
= 1/2 × 100 × 5² = 1250 J
Final kinetic energy = 1/2 mv2²
= 1/2 × 100 ×15² = 11250 J
Work done = Final kinetic energy - initial kinetic energy
= 11250 - 1250
= 10000 J
Work done by the car = 10000 J
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