A truck travelling at 54 km/h is slow down to 36 km/h in 10 sec. Find the retardation

a truck is a big
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We know that, v - u/t = a. So, here 36 - 54/ 10 = - 1.8 i.e. the retardation.
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Here's is the output of your query

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correct answer
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The acceleration is v-u / t so the retardation is negative of acceleration
then, -a =v-u/t 
= 15-10/10 
= -0.5 m per second square
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