A child stands on the edge of the cliff 10 m above the ground and throws a stone horizontally with an initial speed of 5 . Neglecting the air resistance, the speed with which the stone hits the ground will be ______ (given, g = 10 ). [20

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Solution

Q.
A child stands on the edge of the cliff 10 m above the ground and throws a stone horizontally with an initial speed of 5 ${ms}^{- 1}$ . Neglecting the air resistance, the speed with which the stone hits the ground will be ______ ${ms}^{- 1}$ (given, g = 10 ${ms}^{- 2}$ ). [2023]

1 20

2 15

3 30

4 25

Ans.
(2)

$v_{y} = \sqrt{2 g h} = \sqrt{200}$

$v_{net} = \sqrt{25 \times 200} = 15 m/s$

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