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30 July, 18:10

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

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  1. 30 July, 18:31
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    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)
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