You hold a handful of rocks and a handful of feathers. The rocks feel heavier than
the feathers, even though you hold the same amount of both. Which of the following is true?
a) The rocks have more mass, and therefore contain more matter, than the
feathers.
b) The feathers have more mass, and therefore contain more matter, than the
rocks.
c) The rocks and feathers have the same mass.
d) The rocks and feathers have the same amount of matter.