A 15kg box sits on a table. It is not moving.
The force of the table against the box is the ___force.
The force of the box against the table is equal to ___Newtons.
As you know, the earth attracts all bodies to its center.
According to Newton's law, force = mass * acceleration
here acceleration = 9.8 m/s^2 which is the acceleration due to gravity.
Since the body is resting on the table, it is acted upon ...
The solution gives all steps along with proper explanations so that you can solve similar problems yourself.