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A clock has its second hand 2.0 cm long....

A clock has its second hand `2.0 cm` long. Find the average speed and modulus of average velocity of the tip of the second hand in `15 s`.

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The correct Answer is:
A, B, C
In 15 s, it will rotate `90^@` or `1/4th` circle .

`:.` Average speed =`("Total distance")/("total time") =d/t`
`=(2piR//4)/15=(piR)/30=(pi(2.0))/30`
`=(pi/15) cm//s`
Average speed =`("Total distance")/("total time") =s/t`
`=(sqrt2R)/t=(sqrt2(2.0))/15=(2sqrt2)/15 cm//s`
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