Two objects of the same mass are in a room. At which of the following distances will the greatest gravitational force be exerted by one object on another?

2 m
4 m
6 m
8 m

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Donna stretched a spring to increase its length. Nearby in an electrical device, a positive charge attracted a negative charge. Which statement is true about the spring and the negative charge?

They both experienced contact forces.
They both experienced non-contact forces.
The spring experienced a contact force and the charge experienced a non-contact force.
The spring experienced a non-contact force and the charge experienced a contact force.