Q. A 4.5 kg fish swimming 3 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. In a ballistics test, a 24.0 g bullet traveling horizontally at 1100 m/s goes through a 40.0 cm-thick 450 kg stationary target and emerges with a speed of 800 m/s. The target is free to slide on a smooth horizontal surface.What average force does the bullet exert on the target? What is the target's speed just after the bullet emerges?