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Physics, 27.01.2020 21:31 sierrathomas431

A46.0-kg girl is standing on a 157-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 1.48î m/s relative to the plank.

(a) what is her velocity relative to the surface of ice?
(b) what is the velocity of the plank relative to the surface of ice?

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