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Question

A body is projected horizontally with a velocity of 10 m/s from the top of an inclined plane of angle 45. If the body hit the foot of the plane, the height of the plane (in m) is

A
10 m
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B
20 m
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C
30 m
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D
40 m
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Solution

The correct option is B 20 m
We know that the horizontal distance travelled by a body projected horizontally with a velocity u from height h is

x=u2hg
Given x=h
h=u2hg
u22hg=h2h=2u2g=2×10210=20 m

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