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February 28, 2015

Homework Help: physics

Posted by Elisa on Monday, July 7, 2008 at 9:33am.

A 45.0 kg girl is standing on a 163 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.45 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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