A 4.5 kg fish swimming 2 ms swallows an absent minded 1 kg, Ask an Expert

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Q. A 4.5 kg fish swimming 2 m/s swallows an absent minded 1 kg fish swimming toward it at a velocity that brings both fish to a halt immediately after lunch. What is the velocity v of the smaller fish before lunch?

Q. Each of the protons in a particle beam has a kinetic energy of 3.20 10-15 J. What are the magnitude and direction of the electric field that will stop these protons in a distance of 1.00 m?

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