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