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If you will bear with me, I have another question about a
homework problem where the book and I disagree. This one is
from Halliday, Resnick, and Walker Fundamentals of Physics,
5th edition. p. 211 number 47.
"You are on an iceboat on frictionless, flat ice; you and the
boat have a combined mass M. Along with you are two stones of
masses m1 and m2 such that M=6m1=12m2. To get the boat
moving, you throw the stones rearward, either in succession or
together, but in each case with a cetain speed v(rel) relative
to the boat. What is the resulting speed of the boat if you
throw the stones
a) simultaneously
b) m1 then m2
c) m2 then m1?
book:
a) .2 v(rel) (I agree)
b) .210 v(rel)
c) .209 v(rel)
I don't get b) and c).