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Question

In the figure below, if all the 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 string connecting block A of mass 20 kg is T then, just after force F is applied find the values of T and a.

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 there is no unbalanced force acting on block A, tension in the string will be zero.
T=0 N
F=mB.a

a=FmB =10020=5 m/s2

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