an unbanked curve has a radius of 60m. coefficient of friction between tyre of tr and road is 0.75. the distance between two front tyres of truck is 2m. if truck exceeds the speed of safe limit then their

1. inner wheel leaves the ground first
2. outer wheel leaves the ground first
3. bboth leave the ground together

Let the normal reactions on the inner and outer wheels berespectivley.
Let the height of the truck be.

A pseudo force ofacts on its center of mass.

Since the body should remain under rotational equilibrium from the point under the center of mass and touching the ground,


Also

Solving the above equations gives,

and

Hence when speed limit is crossed,becomes zero and the inner tyre leaves the ground.