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tan θ = 0,4
r = 80 m
μs = 0,5
V =__?
V = √(gr (μs + tan θ / 1 - μs tan θ))
V = √(10 • 80 (0,5 + 0,4 / (1 - 0,5 • 0,4 •)
V = √(800 (0,9 / 0,8)
V = √(900)
V = 30 m/s
(E)