A 54-kg skater initially at rest throws a 3.0-kg medicine ball horizontally to the left. Suppose the ball is accelerated through a distance of 2.0 m before leaving the skater's hand at a speed of 7.0m/s . Assume the skater and the ball to be point-like, the surface to be frictionless, and ignore air resistance. Use a vertical y-axis with the positive direction pointing up, and a horizontal x-axis with the positive direction pointing to the right. Determine the acceleration of the ball during the throw. Determine the acceleration of the skater during the throw.