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A man of mass 7.0 kg stands on a weighin...

A man of mass 7.0 kg stands on a weighing scale in a lift which is moving
(a) upwards with a uniform speed of ` 10 ms^(-1)` .
(b) downwards with a uniform acceleration of 5 `ms^(-2)` .
( c) upwards with a uniform acceleration of 5 `ms^(-2)` .
What would be the readings on the scale in each case ?
(d) What would be the reading if the lift mechanism failed and it hurtled down freely under gravity ?

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