phy 201
Your 'cq_1_24.2' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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A steel ball of mass 60 grams, moving at 80 cm / sec, collides with a stationary marble of mass 20 grams. As a result of the collision the steel ball slows to 50 cm / sec and the marble speeds up to 70 cm / sec.
• Is the total momentum of the system after collision the same as the total momentum before?
answer/question/discussion:
P1 = (.06)(.8) + (.02)(0) = .048 kg*m/s
P2 = (.06)(.5) + (.02)(.7) = .044 kg*m/s
So the answer is no they are not the same.
• What would the marble velocity have to be in order to exactly conserve momentum, assuming the steel ball's velocities to be accurate?
answer/question/discussion:
.048 = (.06)(.5) + (.02)(v2)
.018 = .02(v2)
v2 = .9 m/s = 90 cm/sec
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7 min
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&#This looks very good. Let me know if you have any questions. &#