A 45.0 kilogram lady is standing on a 160 kilogram plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The lady begins to walk along the plank at a constant velocity of 1.55 m/s relative to the plank.
(a) Estimate her velocity relative to the surface of ice?
m/s
(b) Estimate the velocity of the plank relative to the surface of ice?
m/s