At what minimum speed will be the normal force become zero ( causing occupants of the car to seem weightless )if r=23.5m/s

Hello guest!

At what minimum speed will be the normal force become zero 

( causing occupants of the car to seem weightless ) if r = 23.5 m.

I understand your question so:
The radius of curvature of a threshold is r = 23.5 m.

The centrifugal force is equal to gravity.

mv² / r = mg

v²  = gr

v = √(gr)

v = √(9,81(m/s²) * 23.5m)

v = 15.183 (m/s) * (3600s/h) * (km/1000m)

v = 54.660 km/h

The vehicle takes off at a speed of v = 54.660 km/h.

Greeting asinus :- )

   !