The initial phase of a particle in simple harmonic motion is 2 π , where x = A sin ( ω t + ϕ ) , then at t = 0 :

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The initial phase of a particle in simple harmonic motion is 2 π ​ , where x = A sin ( ω t + ϕ ) , then at t = 0 :

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x = A sin ( ω t + ϕ ) , ϕ = 2 π ​ At t = 0: x = A sin 2 π ​ = A (maximum displacement) v = A ω cos ( ω t + ϕ ) ⇒ v ( 0 ) = A ω cos 2 π ​ = 0 a = − ω 2 x ⇒ a ( 0 ) = − ω 2 A (maximum magnitude, so restoring force is also maximum) Only statement (D) is correct.

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