# A particle P is projected from a point on the surface of long smooth inclined plane (see figure).

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A particle P is projected from a point on the surface of long 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 second. The speed of projection of P is :

(A) 5 m/s

(B) 10 m/s

(C) 15 m/s

(D) 20 m/s

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Correct option (B) 10 m/s

Explanation:

It can be observed from figure that P and Q shall collide if the initial component of velocity of P along incline. u|| = 0 that is particle is projected perpendicular to incline.