Physics - Acceleration/Velocity/Position Graph (no numbers, just theory)?

Question

A ball bearing rolls backwards and forwards on the vertical track shown in the diagram:
http://i14.photobucket.com/albums/a348/Drakhys-2/slope4a.gif
It always starts to roll from the top of the track, either at the left or at the right. The shadow of the ball is seen on the horizontal ground beneath the track, and the position of the shadow is measured along the ground, with the origin at the bottom of the track at point O. The four statements below concern the motion of the shadow. Identify whether each is true or false.


1. For motion from right to left, the velocity and the acceleration at the point B are both negative.
2. For motion from left to right, the position and the acceleration at point B are both negative.
3. For motion from left to right, the position and the velocity at the point A have opposite signs.
4. For motion from right to left, the position and the velocity at point A are both negative.

I said: F, T, F, T. Is this correct. If not, why?

Answer 1

T,F,T,T
The slope determines the acceleration. A + slope results in - acceleration, and vice versa.
At point A, position is - and acceleration is +
At point B, position is + and acceleration is -
For motion L-->R, velocity is +; R-->L, velocity is -
From this you can get all the answers.

Answer 2

Teach physics in a physics class. Teach biology in a biology class. However, let them remain in their fields. They should not venture past their purpose. If any science subject is used in a public school to advocate the belief that there is no God then the subject has attempted to go further than it can logically go. That is not the job of public school science classes. They are not designed to teach the why of causation. Many classes take too many liberties.