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# 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 ...

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1 months 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 ... 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! Read 120 times 5 Replies
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duddyduddy
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1 months ago
 - Master of Science in Biology- Bachelor of Science (Biology)- Bachelor of Education

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1 months ago
 Could you show steps on how to solve for v1?
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Staff Member
1 months 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 = vremember 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 (Biology)- Bachelor of Education
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1 months ago Edited: 1 months ago, s.h_math
 Thanks a lot sir!Post Merge: 1 months agoAlso the way you wrote out the initial equation first, really helped me out!
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Staff Member
1 months 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 (Biology)- Bachelor of Education