AP EAMCET Engineering 20 Apr 2019 Shift 2 Paper

Two boys conducted experiments on projectile motion with stopwatch and noted some readings. As one boy throws a stone in air at some angle with the horizontal, the other boy observes that after 4 s the stone is moving at an angle 30° to the horizontal and after another 2 s it is travelling horizontally. The magnitude of the initial velocity of the stone is
(Acceleration due to gravity =10 ms−2)