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Fz = mgsinα
T = mgfcosα
S=½at² => a=2s/t²
V=at => V=(2s/t²)*t
V = 2s/t => t = 2s/V
t=1,5 [s]
a = Δv/Δt = 3,12/1,5 [m/s²]
ma = mgsinα - mgfcosα
a=gsinα - gfcosα
f = (gsinα-a)/gcosα