Dear student , In death well, when the motorcyclist is at the uppermost point of the death well, then weight of motorcyclist as well as normal reaction of the ceiling of the chamber in downward direction at this time these forces are balanced by centrifugal force acting on the motorcyclist e g in equilibrium condition, N +mg = mvÂ²/r where , N is the normal reaction between wall and motorcyclist m is mass of motorcyclist v is the velocity of motorcyclist r is the radius hence, due to centrifugal force motorcyclist doesn't drop down when he is at uppermost point on death well now, minimum speed require to perform vertical loop only when N =0 mg = mvÂ²/r v = (rg)Â½ =( 25 * 9 8)Â½ = 15 65 m/s

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Dear student , In death well, when the motorcyclist is at the uppermost point of the death well, then weight of motorcyclist as well as normal reaction of the ceiling of the chamber in downward direction .at this time these forces are balanced by centrifugal force acting on the motorcyclist. e.g in equilibrium condition, N +mg = mv²/r where , N is the normal reaction between wall and motorcyclist. m is mass of motorcyclist v is the velocity of motorcyclist r is the radius . hence, due to centrifugal force motorcyclist doesn't drop down when he is at uppermost point on death well . now, minimum speed require to perform vertical loop . only when N =0 mg = mv²/r v = (rg)½ =( 25 * 9.8)½ = 15.65 m/s

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