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प्रश्न
A body of mass 2 kg is moving with a speed of 20 ms-1. What is its K.E.?
संख्यात्मक
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उत्तर
K.E = `1/2` mv2
K.E = `1/2`(2) (20)2
or K.E = 400 J
Thus K.E is 400J
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