Question: (a) In Problem, remove sphere A and calculate the gravitational potential energy of the remaining three-particle system. (b) Lt A is then put back in

(a) In Problem, remove sphere A and calculate the gravitational potential energy of the remaining three-particle system.

(b) Lt A is then put back in place, is the potential energy of the four-particle system more or less than that of the system in (a)?

(c) In (a), is the work done by you to remove A positive or negative?

(d) In (b), is the work done by you to replace A positive or negative?

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