Three fundamental quantities:
1) Length - measures the distance between two points; unit - metre (m)
2) Mass - amount of matter contained in a body; unit - kilogram (kg)
3) Time - duration between two instances; unit - second (s)
[1.5 marks]
Derived quantity from length and time is speed.
By definition,
Speed = DistanceTime
We can say distance is nothing but length.
So, Speed = LengthTime
The SI unit of speed is m/s. [1.5 marks]