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When forces   F1 , F2 , F3 , are acting on a particle of mass m such that F2   and F4   are mutually perpendicular, then the particle remains stationary. If the force F1  is now removed then the acceleration of the particle is

(a) F 1  / m                                 (b) F2  F3 / m F1

(c)  (F2 – F3 ) / m                        (d)  F2 / m

Ans. a

(22)

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