Asked by a/p

a 5 kg fish swimming at a speed of 1m/s swallows an absent minded 1 kg fish swimming toward it at 4 m/s. the speed of the larger fish after lunch is?

Answers

Answered by drwls
Instantly after the "collision", you can apply the law of conservation of momentum, but shortly afterwards the speed will change if large fish continues to swim.

(5 kg * 1 m/s) + (1 kg * -4 m/s) = 6 kg * Vfinal

Vfinal = 1/6 m/s
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