You throw a baseball straight up. Analyzing the system consisting of just the baseball, compare the sign of the work done by Earth on the ball while the ball goes up with the sign of the work done by Earth while the ball goes down. a. The work is positive on the way up and positive on the way down.
b. The work is positive on the way up and negative on the way down.
c. The work is negative on the way up and positive on the way down.
d. The work is negative on the way up and on the way down because the gravitational force is always downward.
e. The work is zero in both portions of the motion.