Browse Questions

# Which of the following expressions corresponds to simple harmonic motion along a straight line , where x is the displacement and a,b,c are positive constants ?

$(a)\;a+bx-cx^{2}\qquad(b)\;bx^{2}\qquad(c)\;a-bx+cx^{2}\qquad(d)\;-bx$

(D) is the correct option because resistive force in a SHM is always proportional to x

so F(res) proportional to x

F(res) = - bx where b is any positive constant and force is opposite to motion thats why it is negative.