A particle is displaced from the point ( 4 m, 12 m ) to the point ( 9 m, 1 m ) in 30 seconds.

Question

Calculate the direction (with respect to the positive x axis)
of its average velocity vector.

Answer 1

the velocity is (9-4)x+(1-12)y or
v= 5x-11y

direction vector is

r= [(5x)-11y ]/sqrt(121+25)

This is an angle of arc tan 11/5