A body of mass 2 kg is hung on a spring balance mounted vertically in a lift. If the lift moves up with an acceleration equal to the acceleration due to gravity, the reading on the spring balance will be
A
2 kg
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B
2×g kg
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C
4×g kg
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D
4 kg
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Solution
The correct option is D4 kg Suppose F is reading of spring balance. Then, F−2g=2g
or F=4g
So it is 4 kg.wt or 4g-Newton.