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a small child succeeds in lifting a mass of 10 kg on his head but loses balance and the object fall back to the ground if the child has a height of 90 cm find the kinetic energy with which the object strikes the ground |
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Answer» Given, Mass = 10 kg Height = 90 cm = 0.9 m Now, from 3rd equation of motion, v²-u²= 2as v² = 2×9.8×0.9+0² v² = 17.64 m/s Now, we know that, K.E. = 1/2mv² K.E. = 1/2×10×17.64 K.E. = 88.2 Joules |
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