1. The problem statement, all variables and given/known data In the picture 2. Relevant equations In the picture attached. 3. The attempt at a solution For the firecracker problem, I believe the only net external force is gravity. Therefore using, Fnet * delta t = delta p. Change in momentum is 12 kg * m/s. Thus, the final momentum of the system is zero. Is this reasoning correct? Please let me know of any errors in my reasoning. Thank you.