Two balls were released from rest simultaneously and allowed to role down ramps with the same incline. Each ramp had a different surface. The balls were photographed from above at one frame per second and the time lapse photography shown above.
After how many seconds did ball "A" reach its top speed?
After how many seconds did ball "B" reach its top speed?
During what time interval did ball "A" achieve constant acceleration?
Which ball finished first?
Describe the surface in the middle of ramp "A"
What was the magnitude of the greatest acceleration of each ball?
What was the magnitude of the greatest deceleration of each ball?
What was the average speed of each ball after 6 seconds.

For detailed solutions refer to you teacher these are self assessment exercises.

A second run was conducted with different balls and different ramps? The results are shown above.

After how many seconds did the blue ball reach its top speed?
After how many seconds did the red ball reach its top speed?
During what time interval did the blue ball achieve constant acceleration?
Which ball finished first?
What was the magnitude of the greatest acceleration of each ball?
What was the magnitude of the greatest deceleration of each ball?
What was the average speed of each ball after 6 seconds.

For detailed solutions refer to you teacher these are self assessment exercises.