A force \( F_{1} \) acts on a particle so as to accelerate it from rest to a velocity \( v \). T...

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A force \( F_{1} \) acts on a particle so as to accelerate it from rest to a velocity \( v \). The force \( F_{1} \) is then replaced by \( F_{2} \) which decelerates it to rest.
(A) \( F_{1} \) must be equal to \( F_{2} \)
(B) \( F_{1} \) may be equal to \( F_{2} \)
(C) \( F_{1} \) must be unequal to \( F_{2} \)
(D) None of these.
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