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A particle is moving in a straight line ...

A particle is moving in a straight line so that after 't' seconds its distance is 'S' (in cms) from a fixed point of the line is given be S=f(t)=`8t+t^3`.
Find (i) the velocity at time t=2 (ii) the initial velocity (iii) acceleration at t=2 sec

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The correct Answer is:
20 cm/sec, 8 cm/sec, 12 cm/`sec^(2)`
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