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Q.

In the pulley-block arrangement shown, S is a light spring balance and the system is released from rest. If the reading of S is 30 N, the ratio M/m is (Take g=10 m/s2)

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a

2

b

3

c

4

d

2.5

answer is B.

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Detailed Solution

2Mm gM+m=T⇒2M×2×10M+2=30⇒M=6 kg⇒Mm=62=3

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In the pulley-block arrangement shown, S is a light spring balance and the system is released from rest. If the reading of S is 30 N, the ratio M/m is (Take g=10 m/s2)