Roller Ball 1

The diagram below shows a strobe photograph of the motion of a small block sliding in a frictionless spherical bowl. The block is released at point A, slides down the surface to point E, then up to point I. Point E is the lowest point of the bowl.

1. Draw vectors on the diagram to show the direction of the velocity of the block at each of the points A-I. If the velocity is zero at any point, note that explicitly on the figure.
   
   
2. Draw a vector below to indicate the direction of the acceleration of the block at points C, E, & G. Explain how you know in which direction to draw the vectors. If the acceleration is zero, state that explicitly and explain how you know it is zero