Phy 121
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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: ->->->->->->->->->->->-> :
60*80=480
20*0=0
60*50=300
20*70=140
No they are not equal.
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• 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: ->->->->->->->->->->->-> :
It would have to be 110 cm/sec
You don't say how you got this. However if you repeat your apparently correct analysis of the first question, with the 110 cm/s velocity, you should find that the total momentum still changes.
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10 min
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