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2015-06-08T16:03:30+05:30

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If it comes to stop then ,
a = (v-u)/t
v = 0
u = 72 km/h
= 20 m/s
t = 10 s
a = (0-20)/10
= - 20/10
= -2 m/s^2
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2015-06-08T16:05:35+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Since here velocity is not given , we assume the speed as velocity .
u=72 km/h=72*5/18 m/s=20 m/s.
Since final velocity is not given , we assume it to be 0.
v=0 , t=10 s.
⇒a=(v-u)/t=(0-20)/10 m/s²
=-20/10 m/s² = -2 m/s².
The bus is accelerating at the rate of -2 m/s².
or it is decelerating  at the rate of 2 m/s².

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