Questions: An abnormally elastic ball bounces across the floor along the path that is shown. Rank the kinetic energy (KE) of the ball at the three marked locations.

An abnormally elastic ball bounces across the floor along the path that is shown. Rank the kinetic energy (KE) of the ball at the three marked locations.
Transcript text: An abnormally elastic ball bounces across the floor along the path that is shown. Rank the kinetic energy (KE) of the ball at the three marked locations.
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Solution

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Solution Steps

Step 1: Analyze the motion of the bouncing ball

The ball is described as "abnormally elastic," implying minimal energy loss during bounces. Kinetic energy is greatest when the ball's speed is highest. The ball will have maximum speed at the lowest points of its trajectory. Conversely, it slows down as it rises, momentarily reaching zero speed at the highest point of each bounce.

Step 2: Compare the heights of points A, B, and C

Point B is the highest point, meaning it has the lowest speed, and thus the lowest kinetic energy. Point A is the second highest point, making it the middle kinetic energy, and point C is the lowest point meaning it has the greatest kinetic energy.

Final Answer:

  • Greatest KE: C
  • Middlest KE: A
  • Smallest KE: B
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