Q.

A man is standing on a weighing machine placed in a lift. When stationary his weight is recorded as 40 kg. If the lift is accelerated upwards with an acceleration of 2 m/s2,then the weight recorded in the machine will be g=10 m/s2.

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a

32 kg

b

40 kg

c

42 kg

d

48 kg

answer is D.

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Detailed Solution

In stationary lift man weighs 40 kg i.e. 400 N.When lift accelerates upward it's apparent weight =m(g+a)=40(10+2)=480N i.e. 48kgFor the clarity of concepts in this problem kg-wt can be used in place of kg.
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A man is standing on a weighing machine placed in a lift. When stationary his weight is recorded as 40 kg. If the lift is accelerated upwards with an acceleration of 2 m/s2,then the weight recorded in the machine will be g=10 m/s2.