61. A ball is dropped from a height of 16 m on a horizontal floor. If it rebounds to a height of 9 m after striking the floor, the coefficient of restitution between ball and floor is_____________________? September 7, 2025 by Admin A. 1/4 B. 2/3 C. 3/4 D. 4/3 ✅ The correct answer is option C.