A tin can was tied to a garter and was hung on a stick. When a stone was placed in it, the garter stretched to an additional 5 cm length. When another bigger stone was added, the garter stretched again to an additional 9 cm length. ... Which of the following describes how to pull of gravity affected the motion of the garter and the tin can used in the experiment?
A. The mass of the stones in the can was decreased so the pull of gravity also decreased, pulling the garter upward.
B. The mass of the stones in the can was increased so the pull of gravity also increased, stretching the garter downward.
C. The tin can with stones became farther from the center of the Earth causing a decrease in gravitational pull.
D. The tin can with stones became nearer to the center of the Earth causing a decrease in gravitational pull.