Question

Help with 8? I really need some help guys!

Answer 1

It sounds like you're supposed to find the average velocity
`\bar v` over the total 3.8 seconds, which would be given by

`\bar v=(\Delta x)/(\Delta t)=(x-x_0)/(t-t_0)`

where
`x` is the displacement at time
`t`,
`x_0=0` is the initial displacement from the origin, and
`t_0=0` is the starting time. Then the average velocity over the total 3.8 seconds,

`\bar v=\frac xt,`

is determined entirely by the displacement of the particle after 3.8 seconds, so that

`\bar v=(-9.23\,\mathrm m)/(3.8\,\mathrm s)\approx-2.4\,(\mathrm m)/(\mathrm s)`