If a Ball Is Thrown into the Air with a Velocity

question 41

Multiple Choice

If a ball is thrown into the air with a velocity of $58 \mathrm { ft } / \mathrm { s }$ , its height (in feet) after $t$ seconds is given by
$$H = 58 t - 9 t ^ { 2 } .$$
Find the velocity when $t = 9$ .

• A) \(- 101 \mathrm { ft } / \mathrm { s }\)
• B) \(- 104 \mathrm { ft } / \mathrm { s }\)
• C) \(- 106 \mathrm { ft } / \mathrm { s }\)
• D) \(- 103 \mathrm { ft } / \mathrm { s }\)
• E) \(- 99 \mathrm { ft } / \mathrm { s }\)

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Definitions:

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