Which one of the following relationships between the acceleration a a and displacement x of a particle involve simple harmonic motion.

Which one of the following relationships between the acceleration a a

1.	Which one of the following relationships between the acceleration a a and displacement x of a particle involve simple harmonic motion.
Answer» `a=0.7x` `a=200x^2` `a=10x` `a=100x^2` ANSWER :C