Question

A ball is dropped from height $h$ above a smooth horizontal surface. The collision is elastic. Then the motion of the ball is/are

• A. Oscillatory
• B. Periodic
• C. SHM
• D. Straight line motion

Answer 1

Answer: (A), (B), (D)

The correct options are
A Oscillatory
B Periodic
D Straight line motion


$\to$ As collision is elastic so height covered in successive collision is same or time period remains same, so motion is periodic.
$\to$ Particle oscillates between dropping point and ground, straight line motion.
$\to F=mg=\text{const}.$ So does not execute SHM.