Calculate the work required to be done to stop a car of 1500kg moving at a velocity of 60km/h?
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Solution:
Mass of the car = 1500 kg
Velocity = 60 km/hr = 60 x 5/18 = 16.67 m/s
The car is in motion, so its energy = kinetic energy = 1 /2 mv2
= 1 /2 (1500) ( 50/ 3 ) 2 J
= 1/ 2 × (1500) × 2500/ 9 J
= 20.8 x 104J
The kinetic energy of the car, when it comes to rest = 0 J
Work done on object = change in kinetic energy
= 20.8 x 104J − 0 J
= 20.8 x 104J
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