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s.h_math s.h_math
wrote...
Posts: 293
Rep: 3 0
2 years ago
A 30.0 kg object moving to the right at a velocity of 1.00 m/s collides with a 20.p kg object moving to the left with a velocity of 5.00 m/s. If the 20.0 kg object continues to move to the left at a velocity of 1.25 m/s, what is the velocity of the 30.0 kg object.

Hi there this is my question, I always have trouble with putting the direction at the end and I'm unsure how to know the correct direction at the end. Thanks a lot!
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duddyduddy
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Posts: 7825
2 years ago
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- Master of Science in Biology
- Bachelor of Science

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s.h_math Author
wrote...
2 years ago
Could you show steps on how to solve for v1?
wrote...
Staff Member
2 years ago
Sure,

30 - 100 = 30v - 25

-70 = 30v - 25 ..... now move the -25 over.

-70 + 25 = 30v

-45 = 30v ..... now divide both sides by 30.

-45/30 = v

-1.5 = v

remember that we defined negative as going to the left, so the answer is 1.5 m/s to the left.
- Master of Science in Biology
- Bachelor of Science
s.h_math Author
wrote...
2 years ago Edited: 2 years ago, s.h_math
Thanks a lot sir!
Post Merge: 2 years ago

Also the way you wrote out the initial equation first, really helped me out!
wrote...
Staff Member
2 years ago
Yes, the entire premise is based on that idea. I will mark my answer as best answer.
- Master of Science in Biology
- Bachelor of Science
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