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Problem Solving

A boy whose m...

Question

A boy whose mass is $50$ kg stands on spring balance inside a lift. The lift starts to ascend with an acceleration of $2 {m / s}^{- 2}$ . The reading of the machine or balance (g = 10 ${m / s}^{- 2}$ ) is

A

50 kg

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B

zero

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C

49 kg

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D

60 kg

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Solution

The correct option is C 60 kg
The net acceleration will be $g + a$ when a lift is moving upward so, the net weight is :
$R = m (g + a) = 50 \times (10 + 2) = 600 N = 60 k g$

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