When you start a game of pool, your friend breaks the rack of balls with the cue ball at a momentum of 5 kg-m/s. If all the momentums (or momenta) of the balls, including the cue ball, were added together, what would the sum be?
A. 5 kg-m/s
B. The answer will depend on the mass of the balls.
C. The answer depends on the velocity of the balls.
D. The answer depends on the mass and velocity of the balls.

Question

When you start a game of pool, your friend breaks the rack of balls with the cue ball at a momentum of 5 kg-m/s. If all the momentums (or momenta) of the balls, including the cue ball, were added together, what would the sum be?
	A.	5 kg-m/s
	B.	The answer will depend on the mass of the balls.
	C.	The answer depends on the velocity of the balls.
	D.	The answer depends on the mass and velocity of the balls.

osprey · Answer

A CONSERVATION OF (MOSTLY) LINEAR MOMENTUM seems to be the theme here. The system is CLOSED which means that all the force acting are internal ones. UNLESS, say, the play is outside in the middle of a force 10 gale. I think that's the case, at least ... http://perendis.webs.com

jtresatti2 · Answer

that was correct thank you

osprey · Answer

Good, and enjoy your pool, be it swimming or billiards style ... :)