The answer to each of the questions is a single digit integer ranging from 0 to 9.
A very broad elevator is going up vertically with a constant acceleration of 2 m/s2. At the instant when its velocity is 4 m/s a ball is projected from the floor of the lift with a speed of 4 m/s relative to the floor at an elevation of 30o. The time taken by the ball to return the floor is second. Find x. (g = 10 m/s2)