A particle is displaced from the point ( 4 m, 12 m ) to the point ( 9 m, 1 m ) in 30 seconds.
Calculate the direction (with respect to the positive x axis)
of its average velocity vector.
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