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18. A tennis ball is launched straight upward with an initial velocity of 24.5 m/s from the edge of a cliff that is 117.6 meters above the ground. Which quadratic equation could be used to correctly determine when the ball will hit the ground:
I got -4.9t^2 + 24.5t - 117.6 = 0
19. Solve the equation you chose in question 18 to determine when the ball will hit the ground.
I got 8 seconds.
20. Using the same equation, determine when the ball is at a height of 49 meters.
Please help with number 20. This is my final question and I'm dying to get this done and over with. Thanks!
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