A particle projected from the level ground just clears in its ascent a wall `30 m` high and `120sqrt3` away measured horizontally.The time since projection to clear the wall is two second.It will strike the ground in the same horizontal plane from the wall on the other side of a distance of (in metres)

Options

A. `150sqrt(3)`
B. `180sqrt(3)`
C. `120sqrt(3)`
D. `210sqrt(3)`

Answer

b

Explanation

`x=u cos theta.t, y=u sin theta-(1)/(2)g t^(2)`
`R=(2u cos theta. U sin theta)/(g), x'=R-x`