a concrete slab of mass 400 kg accelerates down a concrete slope inclined at 35°. the kinetic between the slab and slope is 0.60. determine the acceleration of the block​

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.