A stone is dropped from rest from the top of a 20text m tower. Its speed on hitting the ground is (g = 10text m/s ^2):

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NEET Physics QUESTION #7315

Question 1

A stone is dropped from rest from the top of a $20\text{ m}$ tower. Its speed on hitting the ground is ($g = 10\text{ m/s}^2$):

Correct Answer Explanation

Using $v^2 = u^2 + 2gh = 0 + 2(10)(20) = 400$

$v = \sqrt{400} = \mathbf{20\text{ m/s}}$