How is momentum conserved in a newton's cradle when one steel ball hits the other?
all the momentum starts in one ball, and after the collision, they share it.
all the momentum starts in one ball, and after the collision, it is all in the other ball.
both balls have momentum to start, and they share it after the collision.
momentum is not conserved in the steel balls of a newton's cradle.

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.