Solve
-A Ball Is Thrown Downward with an Initial Velocity $h = - 4.9 t ^ { 2 } - 42 t + 120$

question 8

Multiple Choice

Solve.
-A ball is thrown downward with an initial velocity of 42 meters per second from a cliff that is 100 meters high. The height of the ball is given by the quadratic equation $h = - 4.9 t ^ { 2 } - 42 t + 120$ where $h$ is in meters and $t$ is the time in seconds since the ball was thrown. Find the time that the ball will be 20 meters from the ground. Round your answer to the nearest tenth of a second.

• A) \(2.0\) seconds
• B) \(1.8\) seconds
• C) \(2.9\) seconds
• D) \(1.9\) seconds

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