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m = 2000 kg
Vo = 72 km/j = 20 m/s
Vt = 0
S = 20 m
F = _&?
W = ∆Ek
F S = ½ m (Vt² - Vo²)
F • 20 = ½ • 2000 • (0 - 20²)
F = - 20000 B ← jwb