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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 ?

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

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(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.
answered Mar 25 by khosla419
 

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