A man of mass 70 kg stands on a weighing scale in a lift which is moving downwards with a uniform ac

Question

A man of mass 70 kg stands on a weighing scale in a lift which is moving downwards with a uniform acceleration of 5 m/s². What would be the reading on the scale? (Take g = 10 m/s²)

Professor PC Thomas Classes · Answer

Moving downwards with acceleration a, the apparent weight is $R = m(g - a) = 70(10 - 5) = 70 	imes 5 = 350$ N.