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
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