Can someone explain this problem to me
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Can someone explain this problem to me

[From: ] [author: ] [Date: 11-07-09] [Hit: ]
Thats why the rock slows down (ie upwards velocity decreases, and then starts accelerating back towards earth.).At the exact moment in time when the rock is stationary at the top of its path, the velocity is zero.-c,......
When a rock thrown straight upward gets to the exact top of its path, the magnitude of its

A) velocity is zero and acceleration is zero
B) Velocity is 10 m/s and acceleration is zero
C) Velocity is zero and its acceleration is about 10 m/s^2.

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Its c.

The acceleration never changes, because gravity is always acting upon it.

Thats why the rock slows down (ie upwards velocity decreases, and then starts accelerating back towards earth.).

At the exact moment in time when the rock is stationary at the top of its path, the velocity is zero.

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c, although on earth the acceleration is closer to 9.8 m/s²

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