Question

what is the amount of work done by a man in pressing a rigid wall with a force of 400 n

Answer 1

force=400n
displacement=0 (since the rigid wall cannot be moved)
work = force × displacement
=400×0J
=0J
therefore no work is done.

Answer 2

Given,

A Man in pressing a rigid wall with a force of 400 N.

To find,

Work down by the man.

Solution,

Work is said to be done when a force is applied on the object and it moves a certain distance or the object is displaced from its initial position.

Here the man is exerting the force of 400 Newtons,

F = 400N

The wall is rigid hence it means the wall is still at its initial position it has not moved any distance.

s = 0 m

⇒   Work Done (W) = F × s

⇒   Work Done (W) = 40 N × 0 m

⇒   Work Done (W) = 0

Therefore, Work done by the man is 0 Joules.