Consider these situations:

1. a ball moving at speed v is brought to rest
2. the same ball is projected from rest so that it moves at speed v
3. the same ball moving at speed v is brought to rest and then projected backward to its original speed

In which case(s) does the ball undergo the largest change in momentum?

1. a
2. a,b
3. a,b,c
4. b
5. b,c
6. c