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Q.

A person of mass 60 kg stands on a weighing machine in a lift which is moving (a) upwards with a uniform retardation of 2.8ms−2 (b) downwards with a uniform retardation of2.2ms−2 . Find the reading shown by the weighing machine in each case.

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a

420 N; 720 N

b

320 N ; 520 N

c

720 N ; 420 N

d

640 N ; 720 N

answer is A.

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Detailed Solution

R=m(g−a)=60(9.8−2.8)     =60×7=420N R=m(g+a)=60(9.8+2.2)      =60×12=720N
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