Physical Science

One object is traveling northeast with a momentum of 12 kg-m/s, while a second object is traveling southwest on the same path as the first object with a momentum of 4 kg-m/s. When the two objects collide, they stick together. What is the momentum after their collision?

(A)16 kg-m/s southwest

(B)8 kg-m/s southwest

(C)16 kg-m/s northeast

(D)8 kg-m/s northeast

I have no answer for this question, I am confused on what they mean about "sticking together"

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1. I think my answer will be B

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2. sticking together means they don't bounce apart.
m1*v1 + m2*v2 = (m1+m2)*v

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3. "sticking together" means the two masses combine into one

the momentum of the system does not change

the collision is "head on" , so the resulting momentum is the same direction as the larger of the two (N-E)

the magnitude is the difference of the two original momenta

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4. Got it, the answer would be D then

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