Hailstorms are observed to stike the  surface of a frozen lake at an angle of
Channel: Doubtnut
Date: 02/08/2020

Hailstorms are observed to stike the  surface of a frozen lake at an angle of `30^(@)` with the vertical and rebound at an angle of `60^(@)` with vertical. Assuming the contact to be smooth, the coefficient of restitution is