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 (see the drawing).
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.

1 answer

6400 N