While you are standing on the ground, you observe your friends pass by in a van traveling at a constant velocity. They drop a ball and you all accurately describe the velocity of the ball. Which description is correct?
b. your friends'
November 19th 2012, 12:06 PM
Re: help with physics
We have two frames. One is your friends and one is yours. In the world of physics. Why should one of them be more correct than another? We're talking about relative motions. That's why a) and b) are wrong. You can't say that anyone is more correct/wrong than another in these reference frames.
Then we have c) and d) left. Then it's rather obvious that c) is the correct answer. Assuming that you both describe the ball correct from your reference frame. And in the text it says so. c) is the correct answer. This is really a question of relativity.