A 10-kg rock and a 20-kg rock are dropped at the same time and there is no air.If the 10-kg rock falls with acceleration a,what is the acceleration of the 20-kg rock?
A)4a
B)2a
C)a
D)a/2
E)a/4

Question

Quizplus · Accepted Answer

The acceleration of an object due to gravity (neglecting air resistance) is constant and independent of the object's mass. Therefore, both rocks will experience the same acceleration which is equal to "a". Hence, the correct choice is (C) "a".

A 10-Kg Rock and a 20-Kg Rock Are Dropped at the Same