What two quantities must stay the same in order for an object to have a constant velocity? a) the speed and kinetic energy must be constant. b) the speed and mass of the object must be constant. c) the speed and direction of travel must be constant. d) the force applied to and direction of travel must be constant.

Because atoms of elements in the same group of thbecause atoms of elements in the same group of the periodic table have the same number of neutrons, they have similar properties. select the best answer from the choices provided t fe periodic table have the same number of neutrons, they have similar properties. select the best answer from the choices provided t f