Question

A force F₁ acts on a particle accelerating it from rest to a velocity v. Force F₁ is then replaced by F₂ which decelerates the particle to rest.
(a) F₁ must be equal to F₂.
(b) F₁ may be equal to F₂.
(c) F₁ must be unequal to F₂.
(d) None of these.

Answer 1

(b) F₁ may be equal to F₂.

Any force applied in the direction opposite the motion of the particle decelerates it to rest.