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A ball with mass M=1 kg is hanging from a wire with no mass and length...

A ball with mass M=1 kg is hanging from a wire with no mass and length l=10 cm. The wire is tilted to angle α=30 degrees. It then hits a vertical wall.
a) What is the velocity of ball V=? right before it hits the wall?
b) Suppose that in collision with the wall the ball loosed a fraction of its energy Ω=1/3. Up to what angle θ=? Does the wire tilt as it tilts back up away from the wall?
c) If the length of the time of collision with the wall is t=0.1 s, what is the average force of the wall exerted on the ball during the collision?

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