Please wait for the animation to completely load.
Two giant tennis balls are released from rest at a certain height. One (the ball on the right) can be dropped after the first ball is dropped. You may change the time delay from 0 to 2.5 s (enter the time delay in the text box and click the "set delay and play" button). The ghost images mark the balls' positions every 0.5 s (position is given in meters and time is given in seconds). Restart.
Choose a 1-s delay (for simplicity) and then answer the following questions.
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