### Solution of Physics Numericals for class 9 (set 1 Q14)

##### May 16, 2019

## Problem Statement

A body of mass 500 g, initially at rest, is acted upon by a force which causes it to move a distance of 4 m in 2 sec. Calculate the force applied.

mass=m = 500 g = 0.5 kg

Initial velocity = u = 0

Distance travelled = s=4 m

Time duration =t= 2 sec

As there is a force, so the motion will be an accelerated motion.

Let the acceleration is a.

From eqn, *s = ut + ½ . a. t^2 = ½ . a. t^2 [as u=0] *

4 = ½ . a . 2^2

a=2 m/s^2

So force applied= m a = 0.5 . 2 N =1 N