A boy standing at the top of a tower of 20 m height drops a stone. Assuming g = 10 m s⁻², the velocity with which it hits the ground is

Question

Dr. Abubacker · Accepted Answer

[Solution from source] For a stone dropped from rest, v² = 2gh = 2 × 10 × 20 = 400, so v = 20 m/s. Forgetting the factor 2 under the root gives about 14 m/s, and v = gh would give an unphysical 200 m/s. Answer (3).

Q. A boy standing at the top of a tower of 20 m height drops a stone. Assuming g = 10 m s⁻², the velocity with which it hits the ground is

Explanation

Reviewed by Dr. Abubacker

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