A ball is projected horizontaly with a speed v from top of a plane inclined at an angle $45^{\circ}$ with the horizontal. How far from the point of projection will the ball strike the plane

Question

$$(a)\; \frac{v^2}{g}\quad (b)\;j_2\bigg (\frac{v^2}{g}\bigg) \quad (c)\;\frac{2v^2}{g} \quad (d)\sqrt 2 \bigg[\frac{2v^2}{g}\bigg]$$