A well-thrown ball is caught in a well-padded mitt. If the deceleration of the ball is , and 1.85 ms elapses from the time the ball first touches the mitt until it stops, what was the initial velocity of the ball

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.