Question

plx answer it............

Answer 1

$use \: equation \: of \: motion \\ v = u + at \\ u = 20 m {s}^{ - } \\ a = - 1m {s}^{ - 2} \\ t = 4sec \\ on \: putting \: value \\ v = 20 + ( - 1)(4) \\ v = 16m {s}^{ - }$
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Answer 2

Hope it help.

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Thanq.