Question

What is my average speed and average velocity if it takes me 2min to complete a round around a circular track of radius 65 meters

Answer 1

average speed =total distance/total time

average velocity = total displacement

total time

here displacement = 0 (since initial and final point is same)

so, average velocity = 0

total distance = 2πr = 2π(65)metres

total time = 2×60 =120seconds

average speed = 2×22×65/(120×7){π=22/7}

av. speed = 2860/840 = 3.40m/s

hope this helps you

Answer 2

Distance in circular motion = Circumference of the circle

As we know, circumference of the circle is denoted by

2 \pi r

Distance=

2 × \frac{22}{7} × 20

= 125.7 metre