Physics
Grade-10
Easy
Question
A boy moves a tied stone above his head in circles, time period of circular motion is 2 sec and it forms a circle of 20 cm radius. What is the speed of rotation?
- 0.5 m/s
- 0.6 m/s
- 0.7 m/s
- 0.8 m/s
Hint:
Deriving formula of Speed, v = 
The correct answer is: 0.7 m/s
Time period, T = 2s
Radius, r = 20cm = 0.20m
Speed, v =
= 0.728 m/s
Hence choice 3 is correct.
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