A particle \( P \) is projected from a point on the surface of smoo...

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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 \( t=4 \mathrm{~s} \). The speed of projection of \( P \) is :-
(A) \( 5 \mathrm{~m} / \mathrm{s} \)
(B*) \( 10 \mathrm{~m} / \mathrm{s} \)
(C) \( 15 \mathrm{~m} / \mathrm{s} \)
(D) \( 20 \mathrm{~m} / \mathrm{s} \)
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