PubMed Bruised Chest References. Aihara R, Millham FH, Blansfield J, Hirsch EF. Emergency room thoracotomy for penetrating chest injury: effect of an institutional protocol.
in math the unit rate is a comparison of two different quantities when they are combined together discover the definition of the unit rate in math with tips from a mathematics tutor in this free video on math lessons
Measurements of speed are a rate. A rate is a ratio between two measurements with different units. This means units of speed are actually two units put together - one unit of distance and one of time.