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[tex]\\ \sf\longmapsto \Delta P=P[/tex]
[tex]\\ \sf\longmapsto m1v1=m2v2[/tex]
[tex]\\ \sf\longmapsto 90(7)=m2(10)[/tex]
[tex]\\ \sf\longmapsto 10m2=630[/tex]
[tex]\\ \sf\longmapsto m2=\dfrac{630}{10}[/tex]
[tex]\\ \sf\longmapsto m2=63kg[/tex]
Bruces mass is 63kg