Phy 231
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: ->->->->->->->->->->->-> :
m1v1 + m2v2 = m1v1 + m2v2
60*80 + 20*0 = 60*50 + 20*70
4800 = 4400
The total momentum before the collision is greater than the total momentum after the collision.
• 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: ->->->->->->->->->->->-> :
The marble's velocity would have to be 90 cm/s in order to conserve momentum.
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15 min
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