A body weighing 5 kgf, placed on a surface of area 0.1 m², exerts a thrust on the surface equal to:

1. 50 kgf
2. 5 kgf
3. 50 kgf m^-2
4. 5 kgf m^-2

5 kgf

Reason — A body when placed on a surface exerts a thrust on the surface which is equal to its own weight. So thrust = weight of the body = 5 kgf.