A particle P is projected from a point on the surface of a smooth inclined plane (see figure). Simultaneously another particle Q is released on the smooth inclined plane from the same position. P and Q collide on the inclined plane after t = 4 seconds. Find the speed of projection in m/s.
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(10)
It can be observed from figure that P and Q shall collide if the initial component of velocity of P and Q on
inclined plane i.e along incline should be equal. That is particle is projected perpendicular to incline.
Time of flight 
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