In fig. the angle of inclination of the inclined plane is 30°. Find the horizontal velocity V₀ so that the
particle hits the inclined plane perpendicularly.

(a) ${\mathrm{v}}_0=\sqrt{\frac{2\mathrm{gH}}{5}}$         (b) ${\mathrm{v}}_0=\sqrt{\frac{2\mathrm{gH}}{7}}$        (c) ${\mathrm{v}}_0=\sqrt{\frac{\mathrm{gH}}{5}}$         (d) ${\mathrm{v}}_0=\sqrt{\frac{\mathrm{gH}}{7}}$