Which of the following relationships between the acceleration (a) and the displacement (x) of a particle involves simple harmonic motion?

Which of the following relationships between the acceleration (a) and

1.	Which of the following relationships between the acceleration (a) and the displacement (x) of a particle involves simple harmonic motion?
Answer» a=0.7x a=`-200x^2` a=-5x a= `100x^3` ANSWER :C