2-29. A steel ball strikes
a block with a vertical velocity 
. The masses of the ball and block are 
and 
, respectively. Assume the floor is smooth, 
, and the coefficient of restitution is 
, determine the velocity of the block just after the
collision.
Conservation of momentum in 
-axis:
Coefficient of restitution in 
-axis:
Conservation of momentum in 
-axis:
Therefore, 
.