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calculate the work required to be done to stop a car of 1650 kg moving at a velocity of 70 km/h? |
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Answer» mass: 1650kg velocity:70km/hr v: 70×5/18 v: 19.4m/s The car is in motion,so it's energy is Kinetic energy: 1/2mv² 1/2×1650(19.4)² 310497J The KE of car ,when it come to rest: 0J WD on object=change in KE 310497-0 310497J Ans |
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