Chapter 1 - Introduction to Physics - Problems and Conceptual Exercises - Page 16: 34

(a) $20.0~m/s=65.6~ft/s$ (b) $20.0~m/s=44.7~mi/h$

See conversion factors (inside front cover). $1~m=3.281~ft$, $1~mi=1609~m$ and $1~h=3600~s$ (a) $20.0~m/s=(20.0~m/s)(\frac{3.281~ft}{1~m})=65.6~ft/s$ (b) $20.0~m/s=(20.0~m/s)(\frac{1~mi}{1609~m})(\frac{3600~s}{1~h})=44.7~mi/h$