A ball of mass 1.5 kg is thrown upward. It leaves the thrower's hand with a velocity of 10m/s. The following questions refer to the motion after the ball leaves the thrower's hand. Assume that the upward direction is positive.  a) How long does it take for the ball to return to the thrower's hand? b) What is the final velocity of the ball just before it reaches the hand? c) What is the change in momentum of the ball?

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