Answer:
1. (in metric unit system)
- mm, cm(the basic), km, m
2. seconds(the basic), minutes, hours, days, months, years, etc..
3. The SI unit for displacement is the meter (m).
4. The most common units of speed are metres per second (m/s), kilometres per hour (km/h) and miles per hour (mph).
5. Unit of acceleration is the metre per second per second (m/s²)
