Final answer:
The ball swinging on a string has tangential velocity, which is the instantaneous linear velocity at any point on its circular path.
Step-by-step explanation:
When a ball is swinging on a string, it exhibits several types of velocities. The correct type of velocity from the given options for the ball swinging on a string is B) Tangential velocity. This is the instantaneous linear velocity of an object that is in rotational motion about an axis. As a ball swings, at every point along its path, the velocity vector is tangent to the circular path, which is why it's called tangential velocity. This kind of motion also involves angular velocity, which describes how fast an object rotates or revolves relative to another point, but the direct answer to the question is tangential velocity.
The ball also experiences gravitational acceleration due to the force of gravity pulling it downwards, but the velocity due to this force is not termed 'gravitational velocity'.