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# Mechanics 3 OCR MEI June 2013 question doubt

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1. In question 3 vi) we are required to find the distance travelled by P from 0s to 2.4s, in a sin SHM of time period 1.26s, at 2.4 (having travelled 1.91 periods, so between 1 3/4 and 2 I get the displacement of P to be -0.3649, so this is the distance left for P to travel towards the centre of motion since it's already reached the amplitude, and this distance (0.3649) is to be taken away from 8 x 0.68 then finding the distance travelled, as 0.3649 is te distance left to travel back firstly as a negative displacement for the second time (think I've solved it)
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