13.42: An object of mass 12M is at rest when it suddenly explo
* u +nff4 lfvmcxf/ ;j0y-fba8des into 3 pieces with masses 3M, 4M and 5M. The piece of mass 3M moves with speed V in the direction shown in the diagram. What is the spee
-xn0m;cyfl/b8v4 f uf *f ajf+d of the piece with mass 5M knowing that it is moving directly to the right?