Fн = m * a
v² - v₀² = 2 * a * S
v₀ = 0
k² * S = 2 * a * S => a = k² / 2
Fн = m * k² / 2
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Verified answer
Fн = m * a
v² - v₀² = 2 * a * S
v₀ = 0
k² * S = 2 * a * S => a = k² / 2
Fн = m * k² / 2