A billiard ball collides in an elastic head-on collision with a ...

[tiffannnnyyyyyy]

A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before collision?
 a. the same as
  c. twice
  b. one fourth
  d. four times

Question 2

I wish to use a positively charged rod to charge a ball by induction. Which statement is correct?
 a. The ball is charged as the area of contact between the two increases.
  b. The ball must be a conductor.
  c. The ball must be an insulator that is connected temporarily to the ground. d. The charge on the ball will be positive.

[Ptupou85]

Answer to Question 1

A

Answer to Question 2

B

[tiffannnnyyyyyy]

Gracias!

[nguyenhoanhat]

Thanks for the timely response, appreciate it