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19. F = m.g.(h/s)
= 9.000 N.10m/s.(0,08 m/3,2 m)
= 2.250 N (d)

20. W × LB = F × LK
360 N × 20 cm = F × 180 cm
7.200 = F × 180
F = 7.200/180
= 40 N (b)
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