Posted by **dan** on Sunday, November 7, 2010 at 5:56pm.

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below.

(a) elastic collision

ball 1 = -.825

ball 2 = 3.17

(b) completely inelastic collision

ball 1

ball 2i solved part A but cant figure out how to get part B started any ideas please help thanks.

- physics please help me -
**bobpursley**, Sunday, November 7, 2010 at 6:04pm
There may be a trick on the wording on part be. It is not universally accepted in wording, but some teachers who don't know better use "completely inelastic collision" to mean the balls are stuck togther, and have the same velocity. If you make that assumption, you can get a velocity,otherwise, it is not solvable.

- physics please help me -
**dan**, Sunday, November 7, 2010 at 7:06pm
i understand but how to i go about solving this that's what i need help in, if that assumption is made.

- physics please help me -
**Anonymous**, Thursday, November 18, 2010 at 9:23am
since they are inelastic, they would stick together.

Final velocities

v1 = v2

momentum is still conserved.

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