Question

A shell fired from the ground is just able to cross in a horizontal direction the top of a wall 90m away and 45m high. The direction of projection of the shell will be:
A. `25^(@)`
B. `30^(@)`
C. `45^(@)`
D. none of these

Answer 1

Correct Answer - c
`h=(u^(2) sin^(2)60^(@))/(2g) and R=(u^(2) sin 2 theta)/g`
`45/180=1/4 tan theta or theta=45^(@)`