Consider these situations:

• (a) a ball moving at speed v is brought to rest
• (b) the same ball is projected from rest so that it moves at speed v
• (c) 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