You decide to test your archery skills. A friend of yours throws
an apple vertically upward, and you fire an arrow into the apple
on its return trip downward. You hit your target when the arrow
impales and becomes firmly lodged in the apple.  The arrow ( Ma)
and the apple (Mb) have identical masses, and their impact
speeds (Va and Vb) are the same.If the speed after the collision
(Vf) is one-third of the arrow’s impact speed, at what angle
(theta) did they collide? (Hint: A clever choice of coordinate
system simplifies this problem a great deal.)  Answers (1)