Question: While two forces act on it, a 10 kg particle is to move at a constant velocity v=(6.8m/s)i +(5.2m/s)j. One of the forces is F1=(4.1N)i +(18.5N)j.
Question 1: What is the j component of the other force?
(in N)
I know the correct answer for above question but explain how to get this answer! Thanks.