Question

A force f1 acts on a particle, so as to accelerate it from rest to velocity v. If the force f1 is replaced by f2, which decelerates it to rest, then
a)f1 and f2 must be zero
b)f1 must be equal to f2
c)f1 may be equal to f2
d)f1 must nor be equal to f2

Answer 1

Heya!!

According to conditions of motion under two forces, f1 and f2 must be action in opposite directions and may be equal, not necessarily must be equal.

So, (C) f1 may be equal to f2 is the right answer

Hope it helps✌️✌️