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Q.

A child stands on the edge of a cliff of 10 m height above ground and throws a stone horizontally with an initial speed of 5ms-1. Neglecting the air resistance, the speed with which the stone hits the ground will be nearly 

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a

10ms-1 

b

15ms-1

c

5ms-1

d

20ms-1

answer is C.

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Detailed Solution

V=u2+2gh

=52+2×10×10=15ms1

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