A particle P is projected from a point on the surface of smooth inclined plane (see figure). Simultaneously another particle Q is released on the smooth inclined plane from the same position. P and Q collide after $t = 4 s$ . The speed of projection of $P ($ in $m / s)$ is $(g = 10 m / s^{2})$ :-

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P & Q collide after 4s.

It means the time of flight for 'P' is 4 sec.

$T_{P} 4 u = \frac{2 u}{g cos 6 0 ^{\circ}} = \frac{2 u}{g cos 6 0 ^{\circ}} = \frac{4 g cos 6 0 ^{\circ}}{2} = g = 10 m / s$

The speed of projection of P is $10 m / s$ .

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