1.

What is work done to increase velocity of car from 36 km/hr to 72 km/hr if mass of car is 1500 kg?

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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