Question

plz fast give answer

Answer 1

periodic motion means which is repeating non periodic motion is which is not repeating random motion examples of periodic motion is season non periodic motion is motion of butter fly 2 question this is ok

Answer 2

The sundial, or shadow-clock, which measures the time of day by means of a shadow cast by the Sun onto a cylindrical stone
If there is no sun then it will not work that's why water clock is better than sun
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