A 44.4-kg girl is standing on a 143-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 1.52î m/s relative to the plank. (a) What is the velocity of the plank relative to the ice surface? ___î m/s (b) What is the girl's velocity relative to the ice surface? ___î m/s

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