Final answer:
The angular speed of the ball just after the hit cannot be determined using the given information.
Step-by-step explanation:
In order to find the angular speed of the ball just after the hit, we need to use the equation:
angular speed = (angular momentum)/(moment of inertia)
Since the angular momentum is not given in the question, we cannot determine the angular speed in terms of f, r, m, δt, and the moment of inertia i. Therefore, the correct answer is None of the options provided.