Which of the following examples represent periodic motion?  (a) A swimmer completing
Channel: Doubtnut
Date: 2020-08-02

Which of the following examples represent periodic motion?  (a) A swimmer completing one (return0trip from one bank of a river to other bank. (b) A freely suspended bar megnet displaced from its `N-S` direction and released. (c)  A hydrogen molecule rotating about its centre of mass. (d) An arrow released from a bow.