shayanreloaded
An electron and proton move towards each other with velocities v1 and v2 resp. The velocity of their center of mass is?



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mukushla
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@experimentX

shayanreloaded
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options are
zero
v1
v2
(v1+v2)/2

experimentX
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must be around v2 ... mp >>> me

shayanreloaded
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actually this is supposed to be a very simple question since this came on my school exam

experimentX
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it is v2

shayanreloaded
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how?

experimentX
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dw:1343812191614:dw

mathavraj
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velocity of centre of mass=m1v1+m2v2 /m1+m2..

shayanreloaded
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yeah i think you are right @experimentX

experimentX
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well ... that's would make
dw:1343812288231:dw

experimentX
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dw:1343812367717:dw

shayanreloaded
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thanks