Question

2.
With regards to type of motion, which of the following statements is true ?
(A) Swinging of arms of a soldier while marching is oscillatory.
(B) The beating of our heart and expansion/contraction of lungs are periodic.
(C) Motion of a spinning top is circular motion.
(D) A freely falling body undergoes rectilinear motion.​

Answer 1

Answer:

B) The beating of our hearts and expansion/contraction of lungs are periodic.

Because periodic are those motion which repeats after a particular time. And all this mention in the answer repeats after a particular time.

Explanation:

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