Question

Two forces are acting on an object at the same point. Determine the angle between the two forces. (-2,7) and (3,-1)

Answer 1

The answer is 56 degree

Answer 2

It is 124 degrees.

Explanation:

You square each coordinate like this:

sqrt(x^2+y^2 )

You will end up getting sqrt(53 and sqrt(10.

Then find the dot product which is -6+-7=-13.

Then cos^-1(-13/sqrt53*sqrt10)

=124 degrees