You drop two rocks from the edge of a cliff. Rock 2 is dropped a short time afte

Question

You drop two rocks from the edge of a cliff. Rock 2 is dropped a short time after rock 1 is dropped. As the two rocks fall, what happens to the distance between the two rocks?

(This question is asking about what happens while they are falling, not after they land, of course.)

Question 5 options:
A)
The distance between the rocks stays the same

B)
The distance between the rocks increases

C)
The distance between the rocks decreases

D)
The distance between the rocks, as they fall, may increase or decrease depending on the amount of time between drops

Explanation / Answer

the distance between the rocks increases. the reason is after the 1st ball is thrown, it starts acclerating and by the time 2nd is thrown, it has a certain velocity. so velocity of 1st rock relative to 2nd rock is not zero but the relative accleration is zero. so now when you observe the 1st rock with respect to second rock,it moves away with a constant velocity. hence the answer is B.

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