A cargo helicopter, descending steadily at a speed of $4\mathrm{.}2\frac{m}{s},$ releases a small package. Let upward be the positive direction for this problem.

$($a$)$ If the package is $18m$ above the ground when it is dropped, how long $($in s$)$ does it take for the package to reach the ground?

What is the initial velocity of the package? How does it compare to that of the helicopter? What is its sign? What about the magnitude and sign of the acceleration? $5$

$($b$)$ What is its velocity $($in $\frac{m}{s})$ just before it lands? $($Indicate the direction with the sign of your answer.$)$

Use the time you found in part $($a$),$ plus the initial velocity and acceleration, in one of the constant acceleration kinematic relations. $\frac{m}{s}$

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