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October 25, 2014

Homework Help: Physics

Posted by JC on Thursday, November 6, 2008 at 5:10am.

I'm having troubles with a few questions.

A tennis ball is thrown vertically upwards. At the top of it's flight, it has:

A. a zero speed and acceleration
B. a zero speed and constant acceleration
C. maximum speed and acceleration
D. maximum speed but zero acceleration
E. none of the above

I think the answer is A, but not quite sure.


Two identical balls are released. One falls in a vacuum and the other through the air. Both balls have:

A. same gravitational force and the same acceleration
B. the same gravitational force acting and different accelerations
C. different gravitational force acting and the same acceleration
D. different gravitational forces acting and different accelerations.

I think D, but I'm not quite sure if there are any graviational effects in a vacuum, and I would think acceleration is different because they're both in different mediums.

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