At what angle should the roadway on a curve with a 50-m radius be banked to allow cars to negotiate the curve at 12 m/s even if the roadway is icy (and the frictional force is zero)

The value is  

Explanation:

From the question we are told that

    The  radius is  

    The  velocity is  

Generally the angle is mathematically represented as

=>      

=>      

=>        

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

not too sure thinking all accelerations are pointed down