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Q.

The pulley shown in the diagram is frictionless. A cat of mass 1 kg moves up on the massless string so as to just lift a block of mass 2 kg. After some time, the cat stops moving with respect to the string. The magnitude of the change in the cat’s acceleration is:

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a

g

b

g3

c

2g3

d

4g3

answer is C.

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Detailed Solution

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F.B.D of cat

20−10=a

a=10 ms−2

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20−T1=2a→(1)

T1−10=a→(2)

20−T1=2a

−10+T1=a_

10=3a

a=103ms−2

Δa=10−103

=30−103

=203=2×103=2g3

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