Question

What is the acceleration of a rock thrown straight upward on the way up? At the top of its flight? On the way down? Assume there is no air resistance.

a) g, 0, −g
b) 0, −g, g
c) −g, g, 0
d) g, g, g

Answer 1

The acceleration of a rock thrown straight upward on the way up is -g, at the top of its flight is 0, and on the way down is g.

Step-by-step explanation:

When a rock is thrown straight upward, its acceleration on the way up is -g, where g is the acceleration due to gravity. At the top of its flight, the rock's acceleration is 0. On the way down, the rock's acceleration is g. This is because the acceleration due to gravity is always downward, whether the object is moving upward or downward.