Solve
-A Ball Is Thrown Upward with an Initial Velocity $h = - 4.9 t ^ { 2 } + 21 t + 110$

question 172

Multiple Choice

Solve.
-A ball is thrown upward with an initial velocity of 21 meters per second from a cliff that is 70 meters high. The height of the ball is given by the quadratic equation $h = - 4.9 t ^ { 2 } + 21 t + 110$ where $\mathrm { h }$ is in meters and $\mathrm { t }$ is the time in seconds since the ball was thrown. Find the time that the ball will be 40 meters from the ground. Round your answer to the nearest tenth of a second.

• A) \(7.3 \mathrm { sec }\)
• B) \(7.4 \mathrm { sec }\)
• C) \(6.6 \mathrm { sec }\)
• D) \(6.5 \mathrm { sec }\)

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