A physics problem? Hmm... Let's see

I’ve made this up and I have no idea how easy or difficult it is.

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Person A has two objects B and C. A performs an experiment in her living room. She places a 100cm high solid wooden box in the centre of the room and continues as follows.

A stands on the 100cm high box and holds each of the objects in turn, away from the box at a total height of 200cm.

1. A drops B onto the solid, flat, horizontal surface of her living room floor. B bounces several times and comes to rest immediately below where it was dropped from.

2. A then drops C in exactly the same way with all the same starting conditions. C strikes the floor but does not bounce. C comes to rest on top of the box that A was standing on.

Question

Can you explain?

Hint

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Note
B is removed before continuing the experiment with C. C does not bounce off B. B and C do not come into contact at all.