# Question #8ce1c

Jan 20, 2018

#### 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 =$\left(2 \cdot 3.70\right) K m$ or $7.4 K m$ or, $740 m$

Now, average velocity = total displacement/total time = $\left(\frac{740}{170}\right) \frac{m}{s}$ or, $4.35 \frac{m}{s}$

Now, distance covered in this time = half the perimeter of the circle i.e $\pi \cdot r$ or, $11.62 K m$ or, $11620 m$

So, average speed = total distance covered/total time = $\left(\frac{11620}{170}\right) \frac{m}{s}$ i.e $68.35 \frac{m}{s}$