Regarding another momentum problem

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The discussion centers on a momentum problem involving a 4 kg object traveling west at 25 m/s colliding with a stationary 15 kg object. After the collision, the 4 kg object bounces eastward at 8 m/s. The correct approach to solve for the final velocity of the 15 kg object requires the use of the elastic collision formula, rather than the inelastic collision formula initially applied by the user. The correct final velocity of the 15 kg object is calculated to be 5.26 m/s in the westward direction.

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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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