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A boy whose mass is 50kg stands on a spring balance inside a lift. The lift starts to ascent with an acceleration of 2ms−2.The reading of the machine or balance (g=10 ms−2) is

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a

50 kg

b

Zero

c

49 kg

d

60 kg

answer is D.

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Detailed Solution

R=m(g+a)=50×(10+2)=600N=60 kg wt

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A boy whose mass is 50kg stands on a spring balance inside a lift. The lift starts to ascent with an acceleration of 2ms−2.The reading of the machine or balance (g=10 ms−2) is