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# CBSE Class 9 Answered

calculate the amount of work required to stop a car of 1000kg moving with speed of 72km/h

72 km/hr = 72 × (5/18) m/s = 20 m/s

Let m be mass and v be velocity of car.

Kinetic energy = (1/2) m v2 = 0.5 × 1000 × 20 × 20 = 2 × 105 J

Work done to stop the vehicle = Kinetic energy of vehicle.

Work done to stop the vehicle = 2 × 105 J

Answered by Thiyagarajan K | 05 Feb, 2024, 08:40: AM

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