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

Question 181

Multiple Choice

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


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

Correct Answer:

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