A ball of mass \( \mathrm{m} \) is attached to a string whose other...

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A ball of mass \( \mathrm{m} \) is attached to a string whose other end is fixed. The system is free to rotate
\( \mathrm{P} \) in vertical plane. When the ball swings, no work

W is done on the ball by the tension in the string.
Which of the following statements is the correct explanation?
(1) Tension is always perpendicular to the direction of motion of the ball.
(2) Tension is an internal force for the ball.
(3) Tension is an external force for the ball.
(4) Since the ball is swinging about the axis, toial displacement is zero.
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