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A particle is moving in a straight line....

A particle is moving in a straight line. Its displacement at any instant t is given by `x = 10 t+ 15 t^(3)`, where x is in meters and t is in seconds. Find
(i) the average acceleration in the intervasl t = 0 to t = 2s and
(ii) instantaneous acceleration at t = 2 s.

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