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x N ------ 1,6cm
x=4 x 1,6 / 0,5
x=12,8N
4 N ----- 5 mm
x ----- 16 mm (1,6 cm)
x = 16 mm* 4 N/ 5 mm
x = 12,8 N
Odp:Wartość siły musi wynosić 12,8 N.