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An open elevator is ascending with a constant speed V of 32ft/sec. A ball is thrown straight up by a boy in the elevator when it is a height h of 100 feet above the ground. The initial speed of the ball with repect to the elevator is Vo= 64ft/sec. (A) What is the maximum height attained by the ball? (B) How long does it take for the ball to return to the elevator?

I don't know where to start or what to plug in, please help me out, much appreciated and thanks.

~Grand