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On Thu, Nov 15, 2001 at 11:56:29AM -0500, Justin Parke wrote:problem where the book and I disagree. This one is from Halliday, Resnick,
If you will bear with me, I have another question about a homework
a combined mass M. Along with you are two stones of masses m1 and m2 such
"You are on an iceboat on frictionless, flat ice; you and the boat have
a) simultaneously
b) m1 then m2
c) m2 then m1?
book:
a) .2 v(rel) (I agree)
Okay, perhaps I'm being blind here, but:
M = 6 * m1 = 12 * m2
so
m1 = 2 * m2
and
M' = M + m1 + m2 = 15 * m2
Initial momentum is zero.
Final momentum = M * v + (m1+m2) * vrel = 0
|v| / |vrel| = (m1 + m2) / M
= (3 * m2) / (12 * m2)
= 1/4
How is everyone else getting 1/5?
Thanks,
J