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Question

In the figure below, all surfaces are assumed to be smooth and the force F=100 N. If the acceleration of block B of mass 20 kg is 'a' and tension in the string connecting block A of mass 20 kg is T, then just after force F is applied,

A
T=0 and a=5 m/s2
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B
T=100 N and a=0
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C
T=200 N and a=5 m/s2
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D
T=100 N and a=5 m/s2
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Solution

The correct option is A T=0 and a=5 m/s2
As no force acts on A,
T=0
Acceleration of B
a=FmB=10020=5 m/s2

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