Question

Basketball and tennis ball:
(a) A tennis ball with (small) mass m2 sits on top of a basketball with (large)
mass m1. The bottom of the basketball is a height h above the ground, and
the bottom of the tennis ball is a height h + d above the ground. The balls
are dropped. To what height does the tennis ball bounce?

Note: Work in the approximation where m1 is much larger than m2, and
assume that the balls bounce elastically.

Answer 1

i guess, 2h+d

Answer 2

the basketball bounces back with the same velocity while the tennis ball will bounce back with it's double velocity since mb >> mt.