Question

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Answer 1

Answer:

oscillatiory motion

Mass

Explanation:

oscillatiory motion is a periodic motion with a fixed time period. In particular simple pendulum executes Simple Harmonic Motion.

Mass of a body is the constituent of atoms and molecules in that body which never change. However Mass energy equivalence E=mc^2 shows mass and energy are interconvertable

Answer 2

3) The motion of pendulum is oscillatory motion.
4) Mass