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ОТВЕТ 1.8 с ; - 222222 м/с2 ;282.84 м/с ;32 см

Объяснение:

дано

v0 =400 м/с

vк = 0

d = 36 см =0.36 м

d1 = 18 см = 0.18 м

n=v0/v(n) =3

t - ?

a - ?

v(18) - ?

d(n) - ?

РЕШЕНИЕ

движение равнозамедленное

средняя скорость Vcp = (v0+v) /2 = (400+0) /2 = 200 м/с

время движения t = d/Vcp =0.36/200 =0,0018 c = 1.8 мс

ускорение a = (v- v0) /t = (0-400) / 0.0018 = - 222222,22 м/с2

скорость пули на глубине 18 см :  

d1 = (v(18)^2 -v0^2) / 2a

v(18) = √(2ad1 +v0^2) =√(2 * - 222222.22*0.18 +400^2) = 282.84 м/с

v(n) = v0/3

d(n) = (v(n)^2 -v0^2) / 2a = (1/9 v0^2 -v0^2) / 2a = -8v0^2 / 18a =  

     = -8*400^2 / 18*(- 222222.22) = 0.32 м = 32 см