Referring to questions such as Edexcel A-Level Pure Year 2 Exercise 7G q2C, I decided to use the angular frequency formula (w=2pi/T) to answer it as it follows through with the x = wAcos(wt) formula for simple harmonic motion. I don't want to get penalised in my final exam for doing something like that. I got the same answer in the end anyway so hopefully there's nothing wrong with this method?

Original post by yuusin

Referring to questions such as Edexcel A-Level Pure Year 2 Exercise 7G q2C, I decided to use the angular frequency formula (w=2pi/T) to answer it as it follows through with the x = wAcos(wt) formula for simple harmonic motion. I don't want to get penalised in my final exam for doing something like that. I got the same answer in the end anyway so hopefully there's nothing wrong with this method?

Probably help to see the question and what you actually wrote, but the

wT = 2pi

is a fairly basic observation for

cos(wt)

as it just says that every t=T=2pi/w the sinusoidal term repeats / you go round the circle.

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