`s(t) = t^4 - 4t^3 - 20t^2 + 20t`

The velocity function is given by the derivative of position function.

`v(t) = (ds(t))/dt`

`v(t) = 4t^3-12t^2-40t+20`

When the particle velocity is 20 then;

`v(t) = 20`

`4t^3-12t^2-40t+20 = 20`

`4t^3-12t^2-40t...

(The entire section contains 142 words.)

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