5°) Na figura acima os blocos A, B e C estão sobre um plano horizontal sem atrito. Sendo F = 100 N, mA = 3,0 kg. m B = 8,0 kg e mC = 9,0 kg, o módulo da aceleração do conjunto e:
a) 2,5 m/s²
b) 4,0 m/s
c) 5,0 m/s
d) 8,0 m/s²
e) 10 m/s² ​
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