m = 80t = 80 000kg
vp = 20m/s
-a = const
s = 6km = 6000m
F = ?
W = ?
-a = vp-vk/t
s = -at²/2
s = v/t · t²/2
s = vt/2 /·2 /:v
t = 2s/v
t = 12 000/20
t = 600s
-a = 20/600
-a ≈ 0,0333m/s²
F = -am
F = 0,0333 · 80 000
F ≈ 2667N
W = Fs
W = 2667 · 6 000
W ≈ 16 000 000J = 16MJ
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m = 80t = 80 000kg
vp = 20m/s
-a = const
s = 6km = 6000m
F = ?
W = ?
-a = vp-vk/t
s = -at²/2
s = v/t · t²/2
s = vt/2 /·2 /:v
t = 2s/v
t = 12 000/20
t = 600s
-a = 20/600
-a ≈ 0,0333m/s²
F = -am
F = 0,0333 · 80 000
F ≈ 2667N
W = Fs
W = 2667 · 6 000
W ≈ 16 000 000J = 16MJ