Question

The x component and y compont of a vector p are 4√3m and -4m.What is the angle made by p with positive x axis

Answer 1

For a vector x i + y j; angle made with  X-axis is given by arctan(y/x)

So angle made arctan[(-4m)/(4√3m)] = arctan(-√3) = -60° (with +ve x-axis)