A stone P P\,P is projected with speed U ms−1U \text{ ms}^{-1}U ms−1 from a point AAA, 10 m above the ground. P P\,P is projected at an angle of 30∘ 30^\circ\,30∘ to the horizontal. B B\,B is the greatest height of PPP, 5 m above AAA.
Find the value of UUU.
Find the horizontal distance travelled.
Find the speed of the ball when it hits the ground.