plz plz please plz plz please plz plz please
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s1=20 cos 45° (-i^) + 20 sin 45° (j^)
s2=15 cos 30°(i^) + 15 sin 30°(j^)
s3= 0 (i^) + 20(-j^)
s=s1+s2+s3
(-20/ root 2 +15 root 3/2+0)i +(20/ root 2 +15/2 -20)j
= -1.15 i+1.64j=sxi+sy j
|s| = root of (sx)^2+ (sy)^2 =2m
tan^ -1 (-1.15/1.64) = 35°
west of north
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