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The displacement s of a moving particle at a time t is given by `s=5+20t-2t^(2)`. Find its acceleration when the velocity is zero.

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Given, `s=5+20t-2t^(2)` velocity `(v) =(ds)/(dt)=20-4t`
Now, `v=0.`
`therefore 20-4t=0`
`therefore t=5`
and acceleration `(a) =(dv)/(dt)=-4`
`((dv)/(dt))_(t=5)=-4`
Hence, the acceleration is-4 unit/`sec^(2).`
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