Wheel is rotating freely at angular speed 800 rotationsper minute (rpm)on an axle which has negligible mass. A second wheel, initially at rest andwith twice the moment of inerta of the first is suddenly coupled to theaxle. What fraction of the original rotational kinetic energy is lost

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s. assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.