The figure shows the paths of a tennis ball your friend drops from the window of her apartment and of the rock you throw from the ground at the same instant. The rock and the ball collide at x = 50.0 m, y = 10.0 m and r n 3.00 s. If the ball was dropped from a height of 54.1 m, determine the velocity ol the rock initially and at the time of its collision with the ball.