Question

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^@`

Answer 1

Correct Answer - 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^@`.