A 45.0-kg girl is standing on a plank that has a mass of 150 kg. The plank,

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A 45.0-kg girl is standing on a plank that has a mass of 150 kg. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless supporting surface. The girl begins to walk along the plank at a constant speed of 1.50 m/s relative to the plank.
(a) What is her speed relative to the ice surface?
(b) What is the speed of the plank relative to the ice surface?
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Thermodynamics An Engineering Approach

ISBN: 978-0073398174

8th edition

Authors: Yunus A. Cengel, Michael A. Boles

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