bonsoir sa fait 1 h j'essaye de résoudre mais j'y arrive pas
on a
m¹c¹(t¹-tf)+m²c²(t¹-tf)+m³c³(t¹-tf)=m⁴c⁴(tf-t²)
je veux avoir c² mais je sais pas comment le sortir svp ( Explication détaillée svp.)
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