Units & Compound Measures
Use consistent units: e.g. \(1 \text{ km} = 1000 \text{ m}\). Compound measures mix quantities: speed, density, pressure.
\(\text{Speed} = \dfrac{\text{Distance}}{\text{Time}}\)
\(\text{Density} = \dfrac{\text{Mass}}{\text{Volume}}\)
Example
Example: A car travels 120 km in 2 hours → Speed = \(\dfrac{120}{2} = 60\) km/h.
Example: 500g in 250 cm³ → Density = \(\dfrac{500}{250} = 2\) g/cm³.
Practice
A car travels 150 km in 3 hours. What is the average speed?
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