A boy on a flat car which is moving up a plane inclined at 53∘ to the horizontal with a constant speed 5 ms-1. He throws a ball towards a stationary  hoop located perpendicular to the incline in such a way that the ball moves parallel to the slope of the incline while going through the hoop. The hoop is 4 m in perpendicular direction of inclined plane. The time (in second) taken by the ball to reach the hoop is 2ns. Find the value of n.