A ball is thrown up into the air at the velocity of 50ft/s. After t seconds, the distance of the ball is 50t - 16t^2. What is the velocity of the ball after the balll hits the ground

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.