Q: A book with many printing errors contains four different expressions for the displacement y of a particle executing simple harmonic motion. Which ones are wrong ?

(a) y = A sin (2π t/T)

(b) y = A sin υ t

(c) y = (A/T) sin (t/A)

(c) y = (A/√2) (sin ωt + cos ωt)

Find the wrong formulae on dimensional ground.

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Ans: (b) , (c)