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A shell fired from the ground is just ab...

A shell fired from the ground is just able to cross horizontally the top of a wall `90 m` away and `45 m` high. The direction of projection of the shell will be.

A

`25^@`

B

`30^@`

C

`60^@`

D

`45^@`

Text Solution

Verified by Experts

The correct Answer is:
D
(d) `h = (u^2 sin^2 theta)/(2 g) and R =(u^2 sin 2 theta)/(g)`
`(h)/(R) = (45)/(180) = (tan theta)/(4) or theta = 45^@`.
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