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A car of mass 1000 kg negotiates a banke...

A car of mass 1000 kg negotiates a banked curve of radius 90 m on a frictionless road . If the banking angle is `45^@` , the speed of car is :

A

`30ms^-1`

B

`5ms^-1`

C

`10ms^-1`

D

`20ms^-1`

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