1. Considering the green dash line is x axis, and the perpendicular line to x green dash line would be y axis.
Then for force 1, F1=438 N,
F1x=438cos10=438x0.985=431 N, F1y=438sin10=438x0.174=76 N
For force 2, F2=358 N
F2x=358cos(-31)=358x0.857=307 N, F2y=358sin(-31)=358x-0.515=-184 N
For the resultant of these two force, F
Fx=F1x+F1y=431+307=738 N, Fy=F1y+F2y=76-184=-108 N
Therefore the magnitude of F =(Fx^2+Fy^2)^1/2= 746 N
So the direction of the force is -8.3 degree to the positive x axis.
a=F/m= 746/3693 N/kg=0.202 N/kg=0.202 m/s2
So the acceleration is 0.202 m/S2
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