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A stone tied to the end of a string of l...

A stone tied to the end of a string of length 50 cm is whirled in a horizontal circle with a constant speed . IF the stone makes 40 revolutions in 20 s, then the speed of the stone along the circle is

A

`pi/s m/s^-1`

B

`pi m/s^-1`

C

`2 pi m/s^-1`

D

`pi/s m/s^-1`

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