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Sahay Sir > Question Answers > Arihant Physics by D.C Pandey > Volume 1 > Chapter 4 - Motion in Plane > A particle is projected from a point A with velocity 2–√u an angle of 45^∘ with horizontal as shown in figure. It strikes the plane BC at right angles. The velocity of the particle at the time of collision is

A particle is projected from a point A with velocity 2–√u an angle of 45^∘ with horizontal as shown in figure. It strikes the plane BC at right angles. The velocity of the particle at the time of collision is

A very broad elevator is going up vertically with a constant acceleration of 2m/s^2. At the instant when its velocity is 4m/s a ball is projected from the floor of the lift with a speed of 4m/s relative to the floor at an elevation of 30^o. The time taken by the ball to return the floor is (g = 10m/s^2 )