A 60 kg person stands on a weighing machine inside a lift. The lift is moving upward but slowing down with acceleration magnitude 2 m/s². Take g = 10 m/s². The reading is:
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Question

A 60 kg person stands on a weighing machine inside a lift. The lift is moving upward but slowing down with acceleration magnitude 2 m/s². Take g = 10 m/s². The reading is:

G1 Physics · Accepted Answer

Moving upward but slowing means acceleration is downward: a = 2 m/s². N - mg = -ma, so N = m(g-a) = 60(10-2) = 480 N.