abdubasheer abdubasheer

09-09-2017
Mathematics

contestada

What distance does a train travel while slowing from 28 m/s to zero in 12 s?

168 m

178 m

236 m

291 m

none of the above

Respuesta :

mreijepatmat mreijepatmat

09-09-2017

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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