French Meaning: The name Jocelyn is a French baby name. In French the meaning of the name Jocelyn is: Medieval male name adopted as a feminine name. German Meaning: The name Jocelyn is a German baby name.
The metric unit (in SI) for time is the second (s). The official definition of second is now (after CIPM): the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom; this definition refers to a caesium atom at rest at a temperature of 0 K.
Rate of Change of DISTANCE is called SPEED. so Units would be distance over time (metre/sec) Rate of Change of DISPLACEMENT is called VELOCITY. So Units would be diaplacement over time (m/s). The difference between the above ones is that Speed is a scalar and velocity is a vector. Rate of Change of VELOCITY is ACCELERATION. So Units would be velocity over time ((m/s)/ s = m/s^2) 'm' can be replaced by any quantity that measures length.