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Kwok is standing on top of a 160-foot tall building and throws a tennis ball straight up with an initial velocity of 24 ft/sec. Homework Help ✎

h(t) = −16t2 + v0t + s0

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

    The tennis ball turns around when v(t) = 0.

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

    Evaluate v(time of impact). Let h(t) = 0 to find the time of impact.