a car of mass 1500 kg moving with a velocity of 60 kilometre per hour. 4 passengers each of mass 50 kg sit in the car and the velocity of the car is reduced by 20 kilometre per hour. calculate the change in the kinetic energy of the car.
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Answer:
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
Explanation:
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