A billiard ball is moving in the x direction at 40.0 cm/s and ...

[xroflmao]

A billiard ball is moving in the x direction at 40.0 cm/s and strikes another billiard ball moving in the y direction at 30.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. What is the change in kinetic energy of the system as a result of the collision?
 a. 0
  c. some negative value
  b. some positive value
  d. No answer above is correct.

Question 2

Which of the following best characterizes electrical insulators?
 a. high tensile strength
  c. good heat conductors
  b. charges on the surface don't move
  d. electric charges move freely

[ambernicolefink]

Answer to Question 1

A

Answer to Question 2

B