Susan and Sally are having a tug-of-war by pulling on the opposite ends of a 5.0-kg rope. Susan pulls with a force of 15-N. Calculate Sally’s force if the rope accelerates toward Susan at 2.0 m/s2

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

helium

oxygen

neon

sodium