Solve
-A Ball Is Thrown Upward with an Initial Velocity $\mathrm { h } = - 4.9 \mathrm { t } ^ { 2 } + 42 \mathrm { t } + 30$

question 97

Multiple Choice

Solve.
-A ball is thrown upward with an initial velocity of 42 meters per second from a cliff that is 30 meters high. The height of the ball is given by the quadratic equation $\mathrm { h } = - 4.9 \mathrm { t } ^ { 2 } + 42 \mathrm { t } + 30$ where $\mathrm { h }$ is in meters and $\mathrm { t }$ is the time in seconds since the ball was thrown. Find the time it takes the ball to hit the ground. Round your answer to the nearest tenth of a second.

• A) \(9.2\) seconds
• B) \(9.8\) seconds
• C) \(15.2\) seconds
• D) \(8.6\) seconds

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