A 45.0 kg girl is standing on a 162 kg plank. The plank, originally at rest, isfree 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 1.44 m/s relative to the plank.
a) What is her velocity relative to the surface of the ice?
b) What is the velocity of the plank relative to the surface of the ice?