Which statement best explains why elements are matter?
a) the building blocks of elements are small particles called atoms.
b) elements are pure substances that cannot be divided chemically.
c) each element is a pure substance composed of one type of atom.
d) an element is a physical substance that has mass and takes up space.

Choice D, as if it takes up mass then it is matter

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j