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pb/pair = vbf/vb
pb/1200 = 1/2 v/v
pb/1200 = 1/2
pb = 1200/2
pb = 600 kg/m^3
no 4
A1 = 6cm²
A2 = 1cm²
v1 = 1,5 m/s
a1.v1 = a2.v2
6.1,5 = 1.v2
v2 = 9 m/s
no 10
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