Physics

Problem

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

10 \mathrm{~m} \mathrm{~s}^{-1}

, (b) downwards with a uniform acceleration of

5 \mathrm{~m} \mathrm{~s}^{-2}

, (c) upwards with a uniform acceleration of

5 \mathrm{~m} \mathrm{~s}^{-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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