Deeki is suspended from a rod at one end of a lecture hall by
an electromagnet. A golf ball gun aimed directly at the monkey cuts
power to the electromagnet when fired. Thus, the monkey begins falling
at the same instant the gun fires the golf ball. The projectile and
target meet in mid air.

Intuitively one might think that the ball
will go over the monkey's head due to its fast speed. However, gravity
accelerates all objects downward at the same rate, meaning the monkey
and the ball will meet at exactly the same point. If the ball was shot
even faster, it would still hit the monkey, but higher above the ground.