Question

the retardation of car is -10m/s2. the intial speed is 10m/s.after what time will the speed of the car be 10m/s

Answer 1

Explanation:

$by \: equation \: of \: motion \\ v = u + at \\ v = 10 {ms}^{ - 1} \\ u = 10{ms}^{ - 1} \\ a = - 10{ms}^{ - 2} \\ \\ putting \: all \: these \: values \: \\ 10 = 10 - 10t \\ \frac{10 - 10}{10} = t \\ \\ t = 0$

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