Question

I don't know where to begin and I'm lost

Answer 1

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


`v(t)=(\mathrm ds(t))/(\mathrm dt)=-\frac2{t^3}`

You want to find the velocity at
`t=2.5`, which would be


`v(2.5)=-\frac2{2.5^3}=-(16)/(125)=-0.128`