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Home > CCG > Chapter 12 > Lesson 12.2.4 > Problem 12-102

12-102.

Perry threw a tennis ball up into the air from the edge of a cliff. The height of the ball was , where y represents the height in feet of the ball above ground at the bottom of the cliff, and represents the time in seconds after the ball is thrown. Homework Help ✎

  1. How high was the ball when it was thrown? How do you know?

    Substitute in for .

  2. What was the height of the ball seconds after it was thrown? What was its height a second after it was thrown? Show all work.

    Use the same method you used to solve part (a).




    ft




    8 ft

  3. When did the ball hit the ground? Write and solve an equation that represents this situation.

    If the ball hits the ground, what is its height above the ground?




    seconds