Z zasady zmiany energii mechanicznej:
Ep + W = Ek
Ep = m*g*h
W = F*h*cos180⁰ = -F*h
Ek = 0.5*m*v²
m*g*h - F*h = 0.5*m*v² -----> F = m*(g - 0.5*v²/h)
F = 1*(9.81 - 0.5*40²/5000) = 9.65 N
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Z zasady zmiany energii mechanicznej:
Ep + W = Ek
Ep = m*g*h
W = F*h*cos180⁰ = -F*h
Ek = 0.5*m*v²
m*g*h - F*h = 0.5*m*v² -----> F = m*(g - 0.5*v²/h)
F = 1*(9.81 - 0.5*40²/5000) = 9.65 N