Odpowiedzi

2010-01-13T10:28:02+01:00
V = 400 m/s
s = 0,4 m

Ek=(m * v²) / 2
W=F*s
Ek = W
(m * v²) / 2 = F * s
F = (m * v²) / (2 * s)

a = F / m
a = (m*v²) / (2 * s)/m
a=(v²) / (2 * s)
a = 400² / (2 * 0,4)
a = 200 000 m/s²
v = a * t
t = v / a
t = 400 / 200 000 = 0,002 s