You are in distant space. A giant boulder, many times larger than you, is at rest in front of you. You tap the boulder lightly with a small hammer. What does the boulder do?
A) It accelerates during the tap, up to a slow speed [slower than walking speed], then keeps moving at that speed.
B) It accelerates both during and after the tap.
C) It accelerates during the tap, up to a high speed [faster than a fast-moving car], then keeps moving at that speed.
D) It remains at rest.
E) It speeds up a little during the tap, but after the tap it soon [within a few minutes] slows down and comes to rest.
A
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