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A particle describes a horizontal circle...

A particle describes a horizontal circle on thesmooth innersurface of a conicalfunnel whose vertex angle is `90^@`. If the height of the plane of the circle above the vertex is 9.8 cm, the speed of the particle is

A

`sqrt (9.8) ms^-1`

B

`0.98 ms^-1`

C

`19.6 ms^-1`

D

`4.9 ms^-1`

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