Question Detail
Question
A ball is dropped from a height h1 onto a fixed horizontal plane and rebounds to a height h2. The coefficient of restitution e between the ball and the plane is given by:
Correct Answer
Option B is the correct answer.
Detailed Explanation
For a ball bouncing on a fixed plane, the speed just before impact u = √(2gh1) and the speed just after impact v = √(2gh2). The coefficient e = v/u = √(2gh2)/√(2gh1) = √(h2/h1).
Hint
Speed is proportional to the square root of the drop/rebound height.