ball is thrown vertically upward from the 12-m level in an elevator shaft with an initial velocity of 18 m/s. At the same instant, an open-platform elevator passes the 5-m level, moving upward with a constant velocity of 2 m/s. Determine when will the ball hit the elevator. Determine where will the ball hit the elevator measured from the ground What is the velocity of the ball when the ball hits the elevator

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