Physics

Grade-10

Easy

Question

# A boy moves a tied stone above his head in circles, time period of circular motion is 4.4 sec, and its speed of rotation is 42 m/s. What is the radius of the circle formed?

- 29.43 m
- 20.24 m
- 30.48 m
- 45.97 m

Hint:

### Use formula, T =

## The correct answer is: 29.43 m

### Time period, T = 4.4 s

Speed, v = 42 m/s

Radius, r = ?

According to formula,

T =

4.4 =

Hence first option is correct.

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