Page APPLIED MECHANICS Velocity ‐ vector quantity equal to displacement time In SI the basic unit is m s in Imperial it is ft s Other common units are km h mi h Conversions  m ft .2 s s  km mi .62 h h Speed of sound in dry air 3 m s at °C it increases by .6 m s for each °C rise Speed of light in a vacuum x m s Acceleration ‐ vector quantity equal to change in velocity time In SI the basic unit is m s in Imperial it is ft s Conversion m s .2 ft s Acceleration due to gravity symbol is .8 m s or 2. ft s Linear Velocity and Acceleration Where u initial velocity v final velocity t elapsed time s displacement a acceleration v u at v u s t s ut at v u as             