Two very small plastic balls of equal mass are released from ...

[jhjkgdfhk]

Two very small plastic balls of equal mass are released from rest. One of them carries +10 C of excess charge and the other one carries +1C of charge.
 
  No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.)
  A) The acceleration of the 10-C ball is 10 times that of the 1-C ball.
  B) The balls always have accelerations of equal magnitude.
  C) The speed of the balls keeps increasing.
  D) The acceleration of the balls keeps increasing.
  E) The acceleration of the 1-C ball is 10 times that of the 10-C ball.

Question 2

Astronaut Sarah leaves Earth in a spaceship at a speed of 0.280c relative to Earth. Sarah's destination is a star system 12.5 light-years away (one light-year is the distance light travels in one year).
 
  According to Sarah, how far did she travel during the trip?
  A) 12.0 light-years
  B) 11.5 light-years
  C) 13.0 light-years
  D) 11.0 light-years
  E) 12.5 light-years

[spencer.martell]

Answer to Question 1

B, C

Answer to Question 2

A