When You Drop a Pebble from Height H,it Reaches the Ground

question 10

Multiple Choice

When you drop a pebble from height H,it reaches the ground with kinetic energy K if there is no air resistance.From what height should you drop it so it will reach the ground with twice as much kinetic energy?

• A) H
• B)2H
• C)4H
• D)8H
• E)16H

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