A 450 kg girl is standing on a 162 kg plank the plank, Ask an Expert

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A 45.0 kg girl is standing on a 162 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 1.42 m/s relative to the plank.

(a) What is her velocity relative to the surface of ice in m/s.

(b) What is the velocity of the plank relative to the surface of ice in m/s

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