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Question

A man standing on the roof of a house of height throws one particle vertically downwards and another particle horizontally with the same velocity . The ratio of their velocities when they reach the earth's surface will be

A
: u
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B
1 : 2
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C
1: 1
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D
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Solution

The correct option is C 1: 1
When particle thrown in vertical downward direction with velocity u then final velocity at the ground level


v = u2+2gh
v2=u2+2ghv=u2+2gh

Another particle is thrown horizontally with same velocity then at the surface of earth.


vx=u

vy=2gh
Horizontal component of velocity vx=u

Resultant velocity, v = u2+2gh

For both the particle final velocities when they reach the earth's surface are equal.

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