Collision

1. A 1.0-kg ball is attached to the end of a 2.5-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a 2.0-kg block initially at rest on a horizontal frictionless surface.
a) What is the speed of the block just after the collision?
b) What is the speed of the ball just after the collision?
c) If the coefficient of static and kinetic frictions are 0.3 and 0.23 respectively between the block and the surface, how far does the block travel before coming to rest?

2. PEi + KEi = PEf + KEf 

3. i know the answer to a) is 4.7m/s but i keep getting it wrong

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