Two boys A and B are sitting on opposite sides of a horizontal turntable which rotates at a constant counterclockwise angular velocity was seen from above. Boy A throws a ball toward B by giving it a horizontal velocity u relative to the turntable to- ward B. Assume that the ball has no horizontal acceleration once released and write an expression for the acceleration arel which B would observe the ball to have in the plane of the turntable just after it is thrown. Sketch the path of the ball on the turn- table as observed by B. A u 0 W B