## College Physics (4th Edition)

(a) The average velocity is $1200~km/h$ (upward) (b) The average acceleration is $15.8~m/s^2$ (upward)
(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)