A car advertisement states that a certain car that Emily Miller love can accelerate from rest to 70km/h in 7 seconds. Fine the car's average accelerate

Average acceleration = (change in speed) / (time for the change)

= (70 km/hour) / (7 seconds)

= 10 km/hr-sec.

That's a valid unit of acceleration ... [ length / time² ] ...

but it's so clunky that we can't relate to it. We usually

want to see acceleration in m/s². So I'll convert this

answer to the more conventional unit.

(10 km/hr-sec) · (1,000 m / 1 km) · (1 hr / 3,600 sec)

= (10 · 1,000 · 1) / (1 · 3,600) m/s²

= 2.78 m/s² (about 0.28 G)