Question

body travels along a circular path of radius 70 m. After travelling
half a revolution in 20 s find the () average velocity, 68) average
speed.​

Answer 1

Answer:

The Average Speed and the Average Velocity are 11m/s and 7 m/s respectively.

Explanation:

Given, Radius = 70 m

Therefore, Circumference = 2 × 22/7 × 70

= 2 × 22 × 10 = 440 m

By condition,

The body travel half of the revolution in 20 secs

which means that the body travelled 220 m

Hence, average speed of the body=distance/time

=220/20=11m/s

Displacement = Diameter

Displacement = 2×radius

Displacement = 2×70 = 140 m

And, Average Velocity = Displacement / Time

= 140 / 20 = 7 m/s (ans).

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