# Chapter 2 - Kinematics in One Dimension - Exercises and Problems: 3

(a) first interval: $v_{ave} = -200~m/min$ second interval: $v_{ave} = 333~m/min$ (b) $v_{ave} = 120~m/min$

#### Work Step by Step

(a) first interval: $v_{ave} = \frac{\Delta~s}{\Delta ~t}$ $v_{ave} = \frac{-400~m}{2~min}$ $v_{ave} = -200~m/min$ second interval: $v_{ave} = \frac{\Delta~s}{\Delta ~t}$ $v_{ave} = \frac{1000~m}{3~min}$ $v_{ave} = 333~m/min$ (b) $v_{ave} = \frac{\Delta~s}{\Delta ~t}$ $v_{ave} = \frac{600~m}{5~min}$ $v_{ave} = 120~m/min$

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