Question

A certain car can accelerate from rest to 70km/h in 7 seconds.Find the cars average acceleration

Answer 1

a= (70-0)/7
a=10 km/hr/sec

10 km/hr = 10 km*100 m/km/(1 hr*3=600 sec/hr)=25/9 m/sec
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a= 25/9 m/sec/sec

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Answer 2

First: we have to express the units of velocity in m/s
70 km/h=70 km/h(1000 m/km)(1h/3600 s)=19.4444....m/s=19.44 m/s

average acceleration= (final velocity -initial velocity)/ time
average acceleration=(19.44 m/s - 0 m/s)/7 s≈2.78 m/s²

Answer: the cars average acceleration would be: 2.78 m/s²