Physics
Grade-10
Easy
Question
A girl is sitting in a merry-go-round. The time period of circular motion of the merry-go-round is 8 sec and it forms a circle of 40 m radius. What is the speed of rotation?
- 30.9 m/s
- 810.4 m/s
- 480.34 m/s
- 31.4 m/s
Hint:
Using the formula for time period
The correct answer is: 31.4 m/s
Time period, T = 8 s
Radius = 40 m
Speed, v = 
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