What is the difference between contact and action-at-a-distance forces?
A. Action-at-a-distance forces are stronger than contact forces.
B. Contact forces are stronger than action-at-a-distance forces.
C. Contact forces require objects to physically touch, while action-at-a-distance forces do not.
D Action-at-a-distance forces require objects to physically touch, while contact forces do not.

A

Contact forces are forces that require the actual contact (touching) of two pieces of matter. ... A field force is a force that works at a distance. No touching is required. Gravity is a good example of a field force, because it works whether or not an object is touching something or touching nothing at all.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west