Two swimmers A and B, of mass 75 kg and 50 kg, respectively, dive off the end of a 200-kg boat. Each swimmer has a relative horizontal velocity of 3 m/s when leaving the boat. If the boat is initially at rest, determine its final velocity, assuming that

(a) The two swimmers dive simultaneously,

(b) Swimmer A dives first,

(c) Swimmer B dives first.

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