Net force always involves more than one object. explain​

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

State the right hand rule of the direction of magnetic field in a conductor carrying current

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?