A 450 kilogram girl is standing on a 150 kilogram plank, Physics

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A 450 kilogram girl is standing on a 150 kilogram plank

A 45.0 kilogram girl is standing on a 150 kilogram 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 1.50 m/s to the right relative to the plank.

a) Find her velocity relative to the surface of the ice?

b) Obtain the velocity of the plank relative to the surface of the ice?

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