This is a problem solving one, i just dont know where to start it though(adsbygoogle = window.adsbygoogle || []).push({});

The speed of a particle in an alternating current is given by the equation:

v = 3 cos t/3, where v is in cm/s and t is in seconds.

The particle's movement begins at its point of equilibrium.

How soon after the start would the particle first reach a displacement of

-4.5cm?

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# Help with trigonmetric function question

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