Q.

A child stands on the edge of a cliff 10 m above the ground and throws a stone horizontally with a speed 5 ms1. Neglecting the air resistance, the speed with which it strikes the ground is

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a

15 ms1

b

20 ms1

c

30 ms1

d

25 ms1

answer is A.

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V=u2+2gh=52+2×10×10=15ms1

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