A 0.4 kg mass takes 8s to reach ground when dropped from a certain height ‘P' above surface of earth. The loss of potential energy in the last second of fall is ____J. [Take g = 10 m/s 2 ]
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(300)
Displacement is 8 th sec.
S 8 =5x15
U = 0.4x10x5x15
U =20x15 = 300
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