An electron and a proton are separated by a distance of 1 m. What ...

[mia]

An electron and a proton are separated by a distance of 1 m. What happens to the size of the force on the proton if the electron is moved 0.5 m closer to the proton?
 
  A) It increases to 4 times its original value.
  B) It decreases to one-half its original value.
  C) It increases to 2 times its original value.
  D) It decreases to one-fourth its original value.
  E) It increases to 8 times its original value.

Question 2

Two cars collide head-on on a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?
 
  A) It was always zero.
  B) It was never zero.
  C) It was not initially zero, but ended up zero.

[Ksh22]

Answer to Question 1

A

Answer to Question 2

A

[mia]

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[Ksh22]

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