Question

If a person will take 11 seconds to complete 1 round in a circular park whose radius is 7 cm, then find the average speed of the person.[ pi (π) = 22/7]:

1. 0 m/s

2. 2 m/s

3. 4 m/s

4. Option 4

5. 8 m/s​

Answer 1

Looks like radius of that circular path is 7 m.

Answer:

Option 3.

Explanation:

Given,

Radius of the circular path is 7 m.

Therefore,

Length of the total path covered by that person should be equal to the circumference of that circular path.

= > Distance travelled = 2π( 7 ) m

= > Distance travelled = 2( 22 / 7 )7 m

= > 44 m

Hence,

= > Speed of that person = distance / time

= > 44 / 11 m /s

= > 4 m / s

Answer 2

Answer:  .4m/s

Explanation:

t=11s

r=7cm

circumfrence = 2$\pi$ r

                      = 2 × 22/7 ×7

                      = 44 cm

       distance = 44 cm

 ∴ speed = distance / time

  ⇒ speed  = 44 / 11

                   = 4 m /s