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

Hailstorms are observed to strike the surface of a frozen lakein a direction making an angle 30^(@) to the vertical and to rebound at an angle of 45^(@) to the vertical. Assuming the contact to be, smooth find the coefficient of restitution.

A particle strikes a horizontal frictionless floor with a speed 'u' at an angle 'theta' with the vertical and rebounds with a speed 'v' at an angle 'alpha' with the vertical. Find the value of 'v' if 'e' is the coefficient of restitution.

A plane wavefront incident on a reflecting surface at and angle of 30^(@) with vertical. Find the angle (acute) of reflected wave with vertical.

A plane wavefront incident on a reflecting surface at and angle of 30^(@) with vertical. Find the angle (acute) of reflected wave with vertical.

A particle strikes a horizontal frictionless floor with a speed u, at an angle theta with the vertical, and rebounds with a speed upsilon , at an angle phi with the vertical. The coefficient of restitution between the particle and the floor is e. The angle phi is equal to :

A particle strikes a horizontal frictionless floor with a speed u, at an angle theta to the vertical, and rebounds with a speed v , at an angle phi to the vertical. The coefficient of restitution between the particle and the floor is e. The magnitude of v is