1.

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)A. `150sqrt3`B. `180sqrt3`C. `120sqrt3`D. `210sqrt3`

Answer» Correct Answer - B
`x=u cos theta.t, y=u sin thetat-1/2"gt"^(2)`
`R=(2u cos theta.u sin theta)/g,x^(1)R-x`


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