Maharashtra Class 9 Answered
the velocity of the car increases from 54 km/hr to 74 km/hr .how much is the work done if the mass of the car is 1500 kg
Asked by balkrishnanakate123 | 02 Oct, 2019, 02:13: PM
Expert Answer
Velocity of car increases from 54 km/h to 74 km/ h
Thus,
Initial velocity is 54 km/h = 54 × 5/18 = 15 m/s
Initial kinetic energy = 1/2 mv2 = 1/2 × 1500 × 15×15 =168750 J
Final velocity is 74 km/h = 74 ×5/18 = 20.55 m/s
Final kinetic energy = 1/2mv2 = 1/2 × 1500 × 20.55 × 20.55 = 316726.87 J
Work done = change in kinetic energy = 316726.87 - 168750 = 147976.87 J
Answered by Shiwani Sawant | 02 Oct, 2019, 06:49: PM
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