At what angle with the horizontal should a ball be thrown so that the range `R` is related to the time of flight as `R = 5 T^2` ? `(Take g = 10 ms6-2)`.

Options

A. `45^(@)`
B. `15^(@)`
C. `60^(@)`
D. `90^(@)`

Answer

A

Explanation

`(2 u^(2) sin theta cos theta)/(g)=5 ((2u sin theta)/(g))^(2)`
`theta = 45^(@)`.