Dont copt from answers i want exact answer if not skips this Hailstones are observed to strike the surface of the frozen l

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Dont copt from answers i want exact answer if not skips
this
Hailstones are observed to strike the surface of
the frozen lake at an angle of 30° with the vertical
and rebound at 60° with the vertical. Assuming
the contact to be smooth, find the coefficient of
restitution.
. A ball of mass m approaches a heavy wall of mass
M with speed 4 m/s along the normal to the wall.
The speed of wall before collision is 1m/s towards
the ball. The ball collides elastically with the wall.
What can you say about the speed of the ball after
collision? Will it be slightly less than or slightly
higher than 6 m/s ? baba