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A toy car of mass 'm' can travel at a fi...

A toy car of mass 'm' can travel at a fixed speed. It moves in a circle on a fixed horizontal table. A string in connected to car and attached to a block of mass 'M' that hangs as shown in fig (The portion of string below the table is always vertical). The coefficient of friction between the surface of table and tyres of the toy car is '`mu`'. The ratio of maximum radius to minimum radius for which the toy car can move in a circular path with 'O' on table is `(r_("max"))/(r_("min"))= ((M+xmum))/((M-mum))` then the value of x is .........

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