Question

A body travels along a circular path of radius 70 m
.After travelling half a revolution in 20 s find the
average velocity and average speed.​

Answer 1

Given:

A body travels along a circular path of radius 70 m

.After travelling half a revolution in 20 s

To find:

the average velocity and average speed.

STEP BY STEP EXPLANATION:

the radius of the circular path is r = 70 cm

the body travels half the circumference

So, distance covered by the body is d = $\pi \: r = \frac{22}{7} \times 70 = 220$cm

Also, the displacement of the body is s = 2d = 2 × 70 =

140 cm

Hence, the average velocity = $\frac{s}{t} = \frac{140}{20} =<strong><u> 7</u></strong>$cm/s

Similary, the average speed is speed =

$\frac{d}{t} = \frac{220}{20} = <strong><u>11</u></strong>$cm/s

Hence verified !