Two points in a plane have polar coordinates (2.50 m, 30.0°) and (3.80 m, 120.0°). determine (a) the cartesian coordinates of these points and (b) the distance between them.

Part b)

Explanation:

Part a)

Polar coordinates is given as

so we have

similarly we have

Part b)

now the distance between two coordinates

the body's situation won't change the forces are equal opposit and on the same body