Q.

If block A is moving with an acceleration of 5 m s-2, the acceleration of B w.r.t ground is

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a

5ms−2

b

52ms−2

c

55ms−2

d

10ms−2

answer is C.

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Detailed Solution

By virtual work method:Acceleration of B w.r.t. A will be 10 ms-2 downward.Apart from this, B also has an acceleration 5  ms-2 in horizontaldirection along with A, so net acceleration of B is102+52=100+25=125=55ms−2
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If block A is moving with an acceleration of 5 m s-2, the acceleration of B w.r.t ground is