HELLO HUMANS. CARE FOR A SPOT OF TEA?

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

Ineed the answer to question 1 , i’m desperate

The air that we breath is made mostly of which gaseous molecule