a stuntman drives a car (without negative lift) over the top of a hill, the cross section of which can be approximated by a circle of radius R =250 m.What is the greatest speed at which he can drive without the car leaving the road at the top of the hill?

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.