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phy121
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.
** CQ_1_24.2_labelMessages **
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
60g*80cm/s+20g*0cm/s= 60g*50cm/s+20g*70cm/s
4800g*cm/s= 4400g*cm/s
No the momentum is not the same after the collision.
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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: ->->->->->->->->->->->-> :
60g*80cm/s+20g*0cm/s= 60g*50cm/s+20g*v
4800g*cm/s= 3000g*cm/s+20*v
1800g*cm/s= 20g*v
V= 90cm/s
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*#&!
&#Very good responses. Let me know if you have questions. &#