Question

There is an elastic ball and a rigid wall. Ball is thrown towards the wall. The work done by the normal reaction exerted by the wall on the ball is​

Answer 1

Answer:

zero

Explanation:The work W performed by a force f when the object upon which it acts is subject to a displacement s is

W = |f| |s| cos θ.

where θ is the angle subtended between the directions of f and s. In other words, the work performed is the product of the magnitude of the force, |f|, and the displacement of the object in the direction of that force, |s| cos θ. It follows that any component of the displacement in a direction perpendicular to the force generates zero work. Moreover, if the displacement is entirely perpendicular to the direction of the force (i.e., if θ = 90◦) then no work is performed, irrespective of the nature of the force. As before, if the displacement has a component in the same direction as the force (i.e., if θ < 90◦) then positive work is performed

Likewise, if the displacement has a component in the opposite direction to the force (i.e., if θ > 90◦

) then negative work is performed.