Regarding another momentum problem

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The discussion centers on a momentum problem involving a 4kg object colliding with a 15kg object at rest. The initial momentum equation used was incorrect because it assumed an inelastic collision, where objects stick together, rather than an elastic collision where they bounce off each other. The correct approach requires applying the conservation of momentum for elastic collisions, which accounts for both objects moving separately after the impact. The user is advised to re-evaluate their calculations using the appropriate formula for elastic collisions. This clarification is crucial for accurately determining the speed and direction of the 15kg object post-collision.
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a 4kg object traveling west a 25 m/s hots a 15 kg object at rest. the 4 kg object bounces eastward at 8 m/s. what is the speed and direction of the 15 kg object.

i set it up at

(m1)(v1)+(m2)(v2)= (mtotal)(vfinal)
100/ 19 = x
5.26 = x

except i solvedfor the final v
IM STUMPED anything on what i did wrong?
 
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your problem here is your formula. You are using a formula where the two objects stick together after the collision. (Inelastic) instead of one where they bounce off.(elastic)
 
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