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# Exam mechanics Question!? watch

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1. A car accelerates uniformly from rest at a speed of 100km/h in 5.8 secs.

(a) Calculate the magnitude of the acceleration of the car in m/s.

Thanks for your time
From John Wood
2. a=?ms-2
u=0ms-1
v=100kmh-1=100000mh-1=1666.67ms-1
t=5.8s

a=(v-u)/t
=(1666.67-0)/5.8
=1666.67/5.8
=287.3568966
=287.36ms-2 (to 2dp)
3. I really dont know how you got that answer, why did u divide 100000 by 60?
4. (Original post by Neo1)
I really dont know how you got that answer, why did u divide 100000 by 60?
you shoudnt divide it by 60 but by (60*60) = 3600
this is because there are 3600 seconds in every hour

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