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प्रश्न
Find the kinetic energy of a car of mass 1000 kg traveling at 72 km/h.
संख्यात्मक
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उत्तर
Given mass m = 1000 kg
velocity v = 72 km/hr = 20 m/s
Now K.E = `1/2` mv2 = `1/2` (1000)(20)2
or,K.E = 2 x 105 J
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