Work Done in Collision

Q. A force exerts an impulse $I$ on a particle changing its velocity from initial velocity $u\text{m/s}$ to final velocity $-2u\text{m/s}$. If the applied force and initial velocity are oppositely oriented along the same line, find the work done by force.

1. $\frac{1}{2}|I|u$
2. $\frac{3}{2}|I|u$
3. $\frac{1}{3}|I|u$
4. $2|I|u$