(a) A 15.0-kg fish swimming at 1.10 m/s suddenly gobbles up a 4.50-kg fish that is initially stationary. Ignore any drag effects of the water. What is the speed of the large fish just after it eats the small one? (b) A 0.150-kg glider is moving to the right with a speed of 0.80 m/s on a frictionless, horizontal air track. The glider has a head-on collision with a 0.300-kg glider that is moving to the left with a speed of 2.20 m/s. Choose the rightward direction as positive. Find the final velocity (magnitude and direction) of each glider if the collision is elastic.