# Recollect the past 3!

Determine the horizontal velocity $$v$$ with which a stone must be projected horizontally from a point $$P$$, so that it may hit the inclined plane perpendicularly. The inclination of the plane with the horizontal is $$x$$ and point $$P$$ is at a height $$h$$ above the foot of the incline.

Details And assumptions

Take $$g=10\frac{\text{m}}{\text{s}^2}$$

$$h = 10\text{ m}$$

$$x = {45}^{\circ}$$

Round off the answer to the nearest integer.

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