Question 3: When velocity and the acceleration of an object are both negative, w

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Question 3: When velocity and the acceleration of an object are both negative, what happens to the object’s motion? A. The object speeds up. B. The object remains at rest. C. The object slows down. D. The object first speeds up, then slows down. E. Nothing happens to the object.
Question 8: As an object thrown upward rises and then falls back to the ground, its speed: A. increases, only. B. decreases, then increases. C. increases, then decreases. D. remains the same. E. decreases.

Question 9: As an object thrown upward rises and then falls back to the ground, its acceleration: A. decreases, only. B. increases, only. C. decreases, then increases. D. increases, then decreases. E. remains the same.
Question 10: A ball is thrown upward and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be: A. the same speed it had when thrown upwards B. less than the speed it had when thrown upwards C. more than the speed it had when thrown upwards D. Not enough information. Question 3: When velocity and the acceleration of an object are both negative, what happens to the object’s motion? A. The object speeds up. B. The object remains at rest. C. The object slows down. D. The object first speeds up, then slows down. E. Nothing happens to the object.
Question 8: As an object thrown upward rises and then falls back to the ground, its speed: A. increases, only. B. decreases, then increases. C. increases, then decreases. D. remains the same. E. decreases.

Question 9: As an object thrown upward rises and then falls back to the ground, its acceleration: A. decreases, only. B. increases, only. C. decreases, then increases. D. increases, then decreases. E. remains the same.
Question 10: A ball is thrown upward and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be: A. the same speed it had when thrown upwards B. less than the speed it had when thrown upwards C. more than the speed it had when thrown upwards D. Not enough information. Question 3: When velocity and the acceleration of an object are both negative, what happens to the object’s motion? A. The object speeds up. B. The object remains at rest. C. The object slows down. D. The object first speeds up, then slows down. E. Nothing happens to the object.
Question 8: As an object thrown upward rises and then falls back to the ground, its speed: A. increases, only. B. decreases, then increases. C. increases, then decreases. D. remains the same. E. decreases.

Question 9: As an object thrown upward rises and then falls back to the ground, its acceleration: A. decreases, only. B. increases, only. C. decreases, then increases. D. increases, then decreases. E. remains the same.
Question 10: A ball is thrown upward and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be: A. the same speed it had when thrown upwards B. less than the speed it had when thrown upwards C. more than the speed it had when thrown upwards D. Not enough information.

Explanation / Answer

3.

Negative acceleration means deacceleration. When negative acceleration is acting on an object its speed slows down.

Hence C. is the right answer.

4.

When an object thrown upward acceleration due to gravity acts downward so a negative accceleration or deaccelration is acting on the object as a rsult speed decreases. But at the time of falling acceleration due to gravity again acts downward but it is along the direction of the object's motion hence it is acting as a acceleration and speed increases.

Hence B. is the right answer.

9.

When an object thrown upward rises and falls acceleration due to gravity always acts downward with a constant magnitude. So acceleration remains same.

Hence E. is the right answer.

10.

A. is the right answer.

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