Please wait for the animation to completely load.
Drag the black rectangle into position (between x = 0.5 m to x = 3.5 m) before you play the animation (position is given in meters and time is given in seconds). Play the animation in order to measure the time when the ball collides with the rectangle. After the ball collides with the rectangle, you must click "reset" to move the rectangle to a new position and play the animation again. Restart.
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