Take two different balls of significantly different weights that can bounce well (a tennis ball and a basketball combination works great) and stack the lighter ball on top of the heavier one. Release them simultaneously and let them hit the floor stacked. What happens?

Perform the following experiment: Take two different balls of significantly different weights that can bounce well (a tennis ball and a basketball combination works great) and stack the lighter ball on top of the heavier one. Release them simultaneously and let them hit the floor stacked. What happens? The two balls hit the ground and bounce upwards, with the lighter ball bouncing significantly higher than where it was released from. The two balls hit the ground and bounce upwards, with the heavier ball bouncing significantly higher than where it was released from. The two balls hit the ground and bounce upwards, neither ball reaching as high as it started from. The two balls hit the ground and bounce upwards, coming to rest pretty close to their starting positions