1. Which of the following sentences best matches the meaning of the equation d = x; – x;? a. The final position is the initial position minus the displacement.
b. The initial position is the final position plus the displacement.
C. The displacement is the initial position minus the final position.
d. The displacement is the final position minus the initial position.

During the apollo moon missions, astronauts were concerned about the effects of newton's third law of motion when: o a. they ejected waste water, because they were concerned that it would push them off course. o b. they reentered earth's atmosphere, because they were carrying heavy moon rocks. o c. they took off from earth, because a large force was required to generate large acceleration. o d. they detected incoming space debris, because the inertia of the debris could damage their ship.