A ball rolling across the centre line of a long level table collides with a second ball of equal mass also on the centre line. Both balls fall off the edge of the table at the same instant of time.

Question

Quizplus · Accepted Answer

If both balls have equal mass and collide centrally, they will exchange velocities and move at the same speed in opposite directions. If they start equidistant from the table's edge, they will fall off at the same instant.

A Ball Rolling Across the Centre Line of a Long