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A particle moves in xy plane with its po...

A particle moves in xy plane with its position vector changing with time (t) as `vec(r) = (sin t) hati + (cos t) hatj` ( in meter)
Find the tangential acceleration of the particle as a function of time. Describe the path of the particle.

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The correct Answer is:
`a_(t) = 0`; path is circular
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