You throw a ball of mass 145 g upward. When the ball is 2m above the ground, headed upward (the initial state), it's speed is 19m/s. Later, when the ball is agin 2 m above the ground, this time headed downward (the final state); it's speed is 19 m/s. What is the change in the kinetic energy of the ball from initial to final state? DeltaK =