Question #8ce1c

1 Answer
Jan 20, 2018

see the explanation zone please

Explanation:

Going half the circle means new position is just to the diametrically opposite point to that of the initial point.

So,displacement = diameter of the circle = 2* radius =#(2*3.70)Km # or #7.4 Km# or, #740 m#

Now, average velocity = total displacement/total time = #(740/170) m/s# or, #4.35 m/s#

Now, distance covered in this time = half the perimeter of the circle i.e #pi*r# or, #11.62 Km# or, #11620 m#

So, average speed = total distance covered/total time = #(11620/170) m/s# i.e #68.35 m/s#