Physics Help PLEASE!!!

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A 10 kg ball moving due west at 2m/sec collided with a 4kg ball that is moving due east at 3m/sec. you determine that immediately after the collision the 10 kg ball is moving due west at .57 m/sec.

a) this probably is a totally elastic collision
b) this definitely is NOT a totally inelastic collision
c) more info is needed

we are to show all of our work.

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