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A recent car advertisement states: "you can legally floor throttle for 5.9seconds" This means that it takes 5.9s to reach a speed of 100kmh^-1 starting from rest. Assume that this situation can be modelled as uniform acceleration.

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1 Answer

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You know that inital velocity (u) is 0, that the final velocity (v) is 100kmh^-1 which equals 27.7778ms^-1 (100/3.6) and you know that the time (t) is 5.9s

Now use the formula v=u+at to find acceleration

It can be rearranged to a=(v-u)/t

Then substitute the values a=27.7778/5.9

a=4.7ms^-2

You need to use ms^-2 as it is the SI unit for acceleration.

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