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

Question

Quizplus · Accepted Answer

Momentum is conserved:$$(5	ext{ kg})(1	ext{ m/s})+(1	ext{ kg})(-4	ext{ m/s})=(6	ext{ kg})(v)$$$$v=\frac{(5	ext{ kg})(1	ext{ m/s})+(1	ext{ kg})(-4	ext{ m/s})}{6	ext{ kg}}=\frac{1	ext{ kg m/s}}{6	ext{ kg}}=\frac{1}{6}	ext{ m/s}$$

A 5-Kg Fish Swimming at 1 M/s Swallows an Absent-Minded