Answer
(a) The average velocity is $1200~km/h$ (upward)
(b) The average acceleration is $15.8~m/s^2$ (upward)
Work Step by Step
(a) We can find the average velocity:
$v_{ave} = \frac{displacement}{time}$
$v_{ave} = \frac{160~km}{8.0~min}$
$v_{ave} = 20~km/min$
$v_{ave} = 1200~km/h$
The average velocity is $1200~km/h$ (upward)
(b) We can find the average acceleration:
$a_{ave} = \frac{\Delta~v}{\Delta t}$
$a_{ave} = \frac{7600~m/s}{(8.0~min)(60~s/min)}$
$a_{ave} = 15.8~m/s^2$
The average acceleration is $15.8~m/s^2$ (upward)
