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December 20, 2014

December 20, 2014

Posted by **jack** on Monday, September 2, 2013 at 10:05pm.

a) positive and negative B) negative and negative c) negative and positive D) negative and zero E) positive and zero

- Physics -
**Devron**, Tuesday, September 3, 2013 at 4:08amIf a particle's speed increase over a time period this means that it has acceleration, therefore you can rule out answer choices D and E. If a particle's speed increases, its' acceleration can not be negative, and therefore must be positive. Therefore, you can rule out A and B. This leaves answer choice C as the best answer choice.

- phsics -
**Graham**, Tuesday, September 3, 2013 at 4:13amIf the speed is increasing, the acceleration cannot be zero.

If the particle also remains moving along the x-axis, the velocity and acceleration must have the same direction.

- Physics -
**Devron**, Tuesday, September 3, 2013 at 4:41amThe statement that the velocity and acceleration MUST be in the SAME DIRECTION is not correct. A particle can have an initial velocity in one direction and have an acceleration in another. Over time, the particle's velocity will not be in the opposite direction of the acceleration, but will be in the direction of the acceleration. This question is basically a question asking do you understand Newton's second law.

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