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5-29.

Kwok is standing on top of a -foot tall building and throws a tennis ball straight up with an initial velocity of ft/sec. Homework Help ✎

  1. How far up does the tennis ball go before it turns around and starts to come down?

    The tennis ball turns around when .

  2. How fast is it going when it hits the ground below?

    Evaluate . Let to find the time of impact.