Pls ans
Q.9. 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 is :-
(A) 5 m/s
(B) 10 m/s
(C) 15 m/s
(D) 20 m/s