Question

Unit of speed is a derived unit, why?

Answer 1

All other SI units are derived by multiplying, dividing or powering the base units in various combinations, For example: mechanical work is force applied multiplied by distance moved and has the unit newton metre written as Nm. speed is distance divided by time and has the unit metre per second written as ms.

Answer 2

As speed= distance/time

i.e L/T which are the fundamental S.I units accepted universally . The unit of speed will be L T^-1