instruction:
Formulate questions about the information mentioned in a given passage.
question:
context: Four balls are dropped. The first is dropped from the height equivalent of a microwave, the second is dropped from the height equivalent of a book, the third is dropped from the height equivalent of a house, and the fourth is dropped from the height equivalent of a mountain.
answer:
What are the things that are dropped?


question:
context: A brick, a microwave, an egg, and a leaf moving at identical speeds each collide with a static hockey puck.
answer:
What are the things that are moving at identical speeds?


question:
context: A person is trying to stack flowers, eggs, bottles, and coins.
answer:

What are the things that the person is trying to stack?