A billiard ball moving at a speed of 2.2 meters/sec strikes an identical stationary ball
a glancing blow. After the collision one ball is found to be moving at a speed of 1.1
meters/sec in a direction making a 60° angle with the original line of motion. Find
the velocity of the other ball (magnitude and direction).Can the collision be inelastic,
given these data?

Question

A billiard ball moving at a speed of 2.2 meters/sec strikes an identical stationary ball
a glancing blow. After the collision one ball is found to be moving at a speed of 1.1
meters/sec in a direction making a 60° angle with the original line of motion. Find
the velocity of the other ball (magnitude and direction).Can the collision be inelastic,
given these data?

anonymous · Answer

Because the balls are of equal mass shouldn't the final velocity of the moving ball equal 0? and shouldnt the final velocity of the stationary ball equal the initial velocity of the moving ball?

anonymous · Answer

How is it that the final velocity of one ball can be 1.1 m/s?

irishboy123 · Answer

|dw:1429817194915:dw|

drawing these always helps.  

and you can see that you need to balance momentum in x and y directions. 

which means building a few equations.