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Themaximum safe speed of a vehicle ona c...

Themaximum safe speed of a vehicle ona circular track is 15 km/h. When the track becomes wet, the maximum safe speed is 10 km/h. The ratio of coefficient of friction of dry, track to that of the wet track is

A

`2:3

B

`3:2

C

`9: 4

D

`1: 1

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