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A 25-g ball moving southward at 30 m/s collides with a 10-g ball moving along the same line with a velocity of 15 m/s southward. After the collision, the 25-g ball attains a velocity of 22 m/s southward. What is the velocity of the 10-g ball?​

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Answer:

35 m/s

Explanation:

momentum before impact = momentum after impact

since they go on the same line both are positive velocity

m1u1 + m2u2 = m1v1 + m2v2

(0.025kg)(30m/s) + (0.010kg)(15m/s) = (0.025kg)(22 m/s) + (0.010kg)(v2)

solving simultaneously:

v2 = 35m/s

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