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Question

When forces F1, F2 and F3 are acting on a particle of mass ′m′ such that F2 & F3 are mutually perpendicular, then the particles remains stationary. If the force F1 is now removed then the magnitude of the acceleration of the particle is

A
F1m
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B
F2F3mF1
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C
(F2F3)m
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D
F2m
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Solution

The correct option is A F1m
The three forces F1, F2 & F3 are in equilibrium.
Also,
F2 is perpendicular to F3
Thus, the resultant of F3 & F2 is equal to F1
Thus,
When the force F1 is removed,
The resultant force on mass m will be F1

Thus, the acceleration of mass will be:
a=F1m

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