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21. How far should a man of mass 60 kg run so that his kinetic energy is 750 J? |
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Answer» mam but in the question they have asked how far and not how fast.... Mass = 60 kgK.E = 750 Jv = ? K.E = (1/2)mv^2 750 = (1/2) × 60 × v^2v^2 = 150/6v = √25v = 5 m/s____________________Hence the man should run with a velocity of 5m/s. |
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