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A simplified model of a bicycle of mass ...

A simplified model of a bicycle of mass M has two tires that each comes into contact with the ground at a point. The wheel base of this bicycle is JV, and the centre of mass C of the bicycle is located mid way between the tires and a height h above the ground.The bicycleis moving to the right,but slowing down at a constant acceleration a. Air resistance may be ignored. Assuming that the coefficient of sliding friction between each tyre and the ground is ` mu` and that both tyres are skidding (sliding without rotating). Express your answer in terms of w,h,M and g .
What is the maximum value of a so that both tyres remain in contact with the ground ?

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