Question

A force acting on a particle of mass 200 g displaces it through 400 cm in 2 seconds. Find the magnitude of the force if the initial velocity of the particle is zero.

• A. 0.1 N
• B. 0.3 N
• C. 0.4 N
• D. 0.5 N

Answer 1

The correct option is C 0.4 N

$s=ut+\frac{1}{2}a{t}^2$

$a=\frac{2s}{t^2}=\frac{2\times 4}{4}=2m{s}^{-2}$

$F=ma=0.2\times 2=0.4N$