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

question 76

Multiple Choice

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

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

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