Which of the following laws states that the momentum of a set of objects is the same both before and after a collision? A.
The law of conservation of momentum

B.
The law of conservation of energy

C.
Newton's first law

D.
Newton's second law

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9