A boy tosses a ball in the vertical direction off the side of a cliff. If the initial velocity of the ball is 15m/s upward and the ball is released 40m from the bottom of the cliff, determine the maximum height (sb) reached by the ball and the speed of the ball just before it hits the ground. During the entire motion of the ball it is subjected to the force of gravity (9.81m/s2). Neglect the effect of air resistance.