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Vo= 0
Vt = 20
t= 5
Vt = Vo + at
20 = 0 + a.5
5a = 20
a = 4
F= m.a
= 2000. 4
= 8000 N
t = 5 dtk
V = 20 m/s
Fdorong ... ?
EK = ¹/₂ m v²
EK = ¹/₂ (2000) (20)²
EK = ¹/₂ (2000) (400)
EK = 1000 (400)
EK = 400000 J
--------------------------------
Cari a :
a = V/t
a = 20 / 5
a = 4 m/s²
---------------------------------
cari S dulu :
S = V₀.t + ¹/₂ a t²
S = 0 + ¹/₂ (4) (5)²
S = 2 (25)
S = 50 m
---------------------------------
W = F S
F = W/S
karena W = EK , maka :
F = EK / S
F = 400000 / 50
F = 8000 N