A stationary 15 kg object is located in a table near the surface of the earth. The coefficient of static friction between the surfaces is 0.40 and the coefficient of kinetic friction is 0.25. A horizontal force of 20 N is applied to the object.
Determine the acceleration of the object.

A horizontal froce of 100N is applied for the to the object

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

because if the tool that you are using is not balanced it there would be false mass.