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The displacement 's ' of a particle at ...

The displacement 's ' of a particle at time 't' is given by ` s = t^3 - 4t^2 - 5t `. Find its velocity and acceleration at ime t= 2 seconds .Also, find t when its acceleration is zero .

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v=-9 unit/sec, a =4 unit/`sec^2 , t= 4/3 ` second
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