A Rock Is Dropped from Rest from a Height H

question 25

Multiple Choice

A rock is dropped from rest from a height h above the ground. It falls and hits the ground with a speed of 11 m/s. From what height should the rock be dropped so that its speed on hitting the ground is 22 m/s? Neglect air resistance.

• A)1.4h
• B)2.0h
• C)3.0h
• D)4.0h
• E)0.71h

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