When You Drop a Pebble from Height H, It Reaches $\sqrt { 2 H }$

question 139

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) 4H
• B) 8H
• C) \(\sqrt { 2 H }\)
• D) 16H
• E) 2H

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