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What is work done to increase velocity of car from 36 km/hr to 72 km/hr if mass of car is 1500 kg? |
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Answer» :Work done = INCREASE in KINETIC energy = 1/2 m v² - 1/2 m u² = 1/2 m ( v² - u² )Given :MASS = 1500 KGV = 72 km/hru = 36 km/hrWork = 1/2 m ( v² - u² ) = 1/2 × 1500 × ( 72² - 36² ) = 750 × ( 72 + 36 )( 72 - 36 ) = 750 × 108 × 36 = 750 × 3888 = 2916000 = 2.916 × 10⁶ANSWER:The work done is 2.916 × 10⁶ |
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