The United States builds between 2 and 5 new nuclear power plants each year for the past 20 years. True or false

Gravitational force i believe

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on

Hey .a. is the correct option