a question was given to us in assignment which was as follows
A person moves 20 metres towards north then 30 metres towards east and then moves 30 x 1.414 metres towards south west. The whole trip takes 5 seconds. What is the person's average velocity for this whole journey?
i just squared every magnitude of velocity in all the three directions and then I took square root of that sum
doing so what i got is this number
55.735267112 so this will be the total displacement of that person and dividing this with the given time [5in this case] we get the answer as 11.1 but the answer is 2 m/s
can any one suggest me where is my concept going wrong