Respuesta :

mreijepatmat
v₁ = initial speed = 28 m/s
v₂ = final speed = 0 m/s  

Average speed = (v₁+v₂) = (28+0)/2 = 14 m/s

d = distance =?
t = 12 s

d = t x (v₁+v₂)/2

d = 12 x 14 = 168 m

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