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Question

In shm i encountered the equation 
V=acoswt =a sin (wt+π/2) and i am not able to understand how we change cos to sin and get positive. Please tell and correct me if i am wrong V=velocity


Solution

Its just because you are thinking in the reverse direction. The equation is perfect because coswt is positive value. So converting it into sine value it must also be a positive value and sine shows positive values in the first 2 quadrants. Therefore v=acoswt=asint(wt+pi/2)

Physics

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