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25-01-2017
Physics

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a car advertisement states that a certain car can accelerate from rest to 70km/h in 7 seconds. find the cars acceleration

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25-01-2017

a = (v2 - v1)/t= acceleration formula

a = (70 - 0)/7
a = 10 km/hr/sec
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It's better to use as few units as possible.
10 km/hr = 10 km*1000 m/km/(1 hr*3600 sec/hr) = 25/9 m/sec
a= 25/9 m/sec/se

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