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A body is projected horizontally from a ...

A body is projected horizontally from a height of `20 m`. It reaches the ground at a horizontally distance of `40 m`. The speed of practicle when it hits the ground is

A

`10 m//s`

B

`10 sqrtm//s`

C

`20 m//s`

D

`20 sqrt(2) m//s`

Text Solution

Verified by Experts

The correct Answer is:
d

Equation of trajectory
`y = (g x^(2))/(2 u^(2)) rArr 20 = (10(40)^(2))/(2 u^(2))`
`u = 20 m//s`
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Knowledge Check

  • A body, rpojected horizontally with a speed u from the top of a tower of height h , reaches the ground at a horizontally distance R from the tower. Another body, projected horizontally from the top of a tower of height 4h , reaches the ground at horizontal distance 2R from the tower. The initial speed of the second body is

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