The amount of gravitational force as the distance between two objects increases; thus, an astronaut’s weight as she or he moves away from Earth into space. pls i need this hurrryyy

Critical mass is the of material required to produce a chain reaction. a.) minimum amount b.) atomic mass c.) precise amount d.) maximum amount

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •