Question

A body of mass 3kg is lying on the ground,then the normal reaction exerted by the ground on the body is

Answer 1

It may be the same 3kg because of Newtons third law of motion

Answer 2

Given :

Mass of body , m = 3 kg .

To Find :

The normal reaction exerted by the ground on the body .

Solution :

We know , magnitude of normal reaction is equal to the amount of gravitational force exert by the earth .

So , $N=mg$       .... ( 1 )

Here , g is acceleration due to gravity $g=9.8\ m/s^2$ .

Putting value of m and g in equation 1 .

We get ,

$N=3\times 9.8\ N\\\\N=29.4\ N$

Therefore , normal reaction exerted by the ground on the body is 29.4 N .

Hence , this is the required solution .