Answer for a rock thrown straight upward, taking the upward direction as positive (+). Choose the statement which most correctly describes the direction of the acceleration for all times.
The acceleration of this rock is negative on the way up, positive at the top, and positive on the way down.
The acceleration of this rock is negative on the way up, negative at the top, and negative on the way down.
The acceleration of this rock is positive on the way up, positive at the top, and negative on the way down.
The acceleration of this rock is positive on the way up, negative at the top, and negative on the way down.