A man of mass 70 kg stands on a weighing scale in a lift which is moving: (a) upward with a speed of

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A man of mass 70 kg stands on a weighing scale in a lift which is moving:
(a) upward with a speed of 10m/s.
(b) downwards with uniform acceleration of 5m/s².
(c) upward with uniform acceleration of 5m/s². What would be the reading on the scale in each case.
(d) What would be the reading if the lift mechanism trade and it hurtled down freely under gravity.

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