A cannon fires a shell toward a target with a momentum of 6750 kg m/s. This shell moves with a velocity of 150 m/s. Calculate the shell's mass.

Which statements best describe energy? check all that apply. the total amount of energy in the universe remains constant. the total amount of energy in the universe changes constantly. energy cannot be converted from one form to another. energy can be converted from one form to another. energy cannot be created or destroyed. energy can be created or destroyed.