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jahrollins
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Homework Statement
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest. It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air resistance is negligible, and the collision is elastic. The masses of the ball and block are, respectively, 1.60 kg and 2.40 kg, and the length of the wire is 1.20 m. Find the velocity (magnitude and direction) of the ball (a) just before the collision, and (b) just after the collision.
Homework Equations
.5m1v2 = mgh
m1v1 + m2v2 = m1vf1 + m2vf2
The Attempt at a Solution
So I've got part a ~
.5m1v2 = mgh
v2 = 2gh
and I'm lost on part b:
m1v1 + m2v2 = m1vf1 + m2vf2
since the final velocities of the ball and box are unknown how do I solve?