First slide
Work
Question

In case of freely falling body, the ratio of KE of the body at the end of 4th second to increase in KE in the next four seconds is

Moderate
Solution

KE4ΔKE=12mv4212mv82v42=(g×4)2(g×8)2(g×4)2=g2×16(6416)g2=1648=13

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