Water flows through a horizontal pipe of...

Water flows through a horizontal pipe of radius 1 cm at a speed of 8 cm `s^(-1)`. What will be the speed of flow of water under similar conditions, if the radius of the pipe is doubled ?

8 cm `s^(-1)`

4 cm `s^(-1)`

2 cm `s^(-1)`

1 cm `s^(-1)`

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