$[-/4$ Points$]$

SERPSE$103\mathrm{.}4.$P$\mathrm{.}015.$

The helicopter view in the figure shows two people pulling on a stubborn mule. The person on the right pulls with a force vec$(F{)}_1$ of magnitude $115N$ and direction of ${}_1=55\mathrm{.}0.$ The person on the left pulls with

force vec$(F{)}_2$ of magnitude $105\mathrm{.}5N$ and direction of ${}_2=63\mathrm{.}0.$

$($a$)$ Find the single force that is equivalent to the two forces shown. The forces are measured in units of newtons $($symbolized $N).$

Nhat$(i)+Nj$

$($b$)$ Find the force that a third person would have to exert on the mule to make thi resultant force equal to zero.

$Ni+$

$Nj$

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