Does v represent speed in kinetic energy formula?

1. Apr 30, 2015

Mr Davis 97

Since kinetic energy is in is a scalar quantity in joules, then is the v in (1/2)mv2 speed or velocity?

2. Apr 30, 2015

jbriggs444

Either will work. If it is taken as a scalar then you would use scalar multiplication to compute v2 If it is taken as a vector then the vector dot product $v{\cdot}v$ will produce the same result.