Find (a) the magnitude and (b) the direction of the net force on an object given that the following forces act on the object at the same time: 10N east, 20N down, 20N west, 30N down, and 20N up.

Answer 1

the vectors are
<10,0>
<0,-20>
<-20,0>
<0,30>
<0,20>

Add 'em up and you have <-10,30>

Now just convert that to polar form.