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Question

Find the reading of the spring balance if it is assumed to be of negligible mass.
(Take g=10 m/s2)


A
3 kg
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B
2.4 kg
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C
2 kg
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D
2.5 kg
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Solution

The correct option is B 2.4 kg

For the whole system, acceleration is
a=3g2g5=g5


For 3 kg body,

3gT=3a
T=3(ga)=3×4g5=12×105=24 N
Hence, the reading will be =2410=2.4 kg

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