Question

A particle moves along the circular path of radius 10 m.If it completes half revolution in 5 s .What's the average velocity of the particle?

Answer 1

Explanation:

ANSWER

When the particle completes half revolution change in velocity

Δv=[5−(−5)]m/s=10m/s

Time taken to complete the half revolution is

t=

v

πr

=

5

π×5

=πs

Thus, average acceleration =

t

Δv

=

π

10

m/s

2

.

Answer 2

Answer:  (-6.28) m/s

Explanation:

• Given:- Radius of circular path=10 m

                     Time taken for half revolution= 5 s

• To find:- Average velocity of the particle.
• Solution:-

          Distance covered in half revolution= $\pi r$      

                                                                     = 31.4 m

           ∴ Average velocity= $\frac{31.4}{5} m/s$

                                           = (-6.28) m/s

• Here negative sign shows the direction of the motion which is opposite to the direction in which the motion is started.
• Hence, the required velocity is (-6.28) m/s.

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