Question

A ball of mass m collides with a wall with speed v and rebounds on the same line with the same speed. If the mass of the wall is taken as infinite, then the work done by the ball on the wall is:

• A. $mv^{2}$
• B. $\frac{1}{2}mv^{2}$
• C. 2mv
• D. Zero

Answer 1

Answer: (D)

Zero

Answer 2

Since the wall has infinite mass therefore the displacement is zero.