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
$$H = 58 t - 9 t ^ { 2 } \text {. }$$
Find the velocity when $t = 9$.

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The Answer of 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
$$H = 58 t - 9 t ^ { 2 } \text {. }$$
Find the velocity when $t = 9$.

If a Ball Is Thrown into the Air with a Velocity