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A 46,0-kg girl is standing on a 161-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant
velocity of 1.461 m/s relative to the plank.
(a) What is the velocity of the plank relative to the ice surface?
1 m/s
(b) What is the gitt's velocity relative to the ice surface?

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