Question

15kg fish velocity is 1.10 and it eats 4.5 kg fish is at rest and what is the speed of the fish after eat the samll fish

Answer 1

0.84 m/s -Since the momentum is always conserved , the initial momentum is 16.5 kg m/s ,  after the large fish eats the poor little fish , the velocity of the big fish has to decrease to conserve the momentum. Therefore the velocity of the aggressive fish is 0.84ms-1