Answer:
Any two forces acting on each other, which are not equal and opposite ( thereby causing motion ) are unbalanced forces.
Explanation:
Expierience
I'm gonna have to assume the girl is on the right side and boy on left.
The net force is the sum of all forces on an object (includes negatives).
Let's say the force of the boy is variable <em>b</em>. Use the formula F = ma.
<em>b </em>+ 3.5 = 0.2(2.5)
This is now simple algebra. Solve to get that <em />the boty is exerting a force of -3N to the left.
The tangent of that angle is 17.63/100 = 0.1763 .
My calculator says that the angle with that tangent is 9.9985° .
10° is awfully close, and it's a much easier answer.
(It's less than 0.015% wrong.)