A cargo helicopter, descending steadily at a speed of $4\mathrm{.}5\frac{m}{s},$ releases a small package. Let upward be the positive direction for this problem.

$($a$)$ If the package is $46m$ above the ground when it is dropped, how long does it take for the package to reach the ground?

$s$

$($b$)$ What is its velocity just before it lands? $($Indicate the direction with the sign of your answer.$)$

$\frac{m}{s}$

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