A block of mass 2 kg travels along a horizontal frictionless surface
with velocity 3 m/s. The mass collides with a another mass, m, and
rebounds with velocity 1 m/s. What impulse was delivered to mass m?

1. 8 N-s
2. 4 N-s
3. -4 N-s
4. -8 N-s
5. No impulse was delivered.
6. Not enough information.