A 450 kg girl is standing on a 159 kg plank the plank, Ask an Expert

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A 45.0 kg girl is standing on a 159 kg plank. The plank, originally at rest, isfree to slide on a frozen lake, which is a flat, frictionlesssurface. The girl begins to walk along the plank at a constantvelocity of 1.41 m/s relative to theplank.

(a) What is her velocity relative to the surface of ice?

m/s

(b) What is the velocity of the plank relative to the surface ofice?

m/s

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Category:- Physics
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