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

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

A

`5ms^(-1)`

B

`10ms^(-1)`

C

`20 ms^(-1)`

D

`30ms^(-1)`

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