Regan has an empty glass cup. it has a mass of 0.3 kg. she drops the cup on the ground and it shatters into several pieces. if she collected all of the pieces of the cup, how much mass would all of the pieces have combined? a. more than 0.3 kg b. less than 0.3 kg c. there is no way to determine the mass of the shattered glass. d. exactly 0.3 kg

The correct answer is option D, that is, exactly 0.3 Kg.  

This is due to the fact that at the time of a physical change, like getting dissociated into fragments or parts, mass is conserved. In the given case, the glass cup exhibited a mass of 0.3 Kg prior of getting dissociated, so in case, if Regan gathered all the dissociated parts, they would possess a mass of exactly 0.3 Kg in combination.