I need some practice with these problems in Physics. I'm taking some extra work so I can study so I'm using a few practice problems. Please show the work so I can study it!! Please include all the work states. The photos are where the questions are Refer to the photos below to answer, thanks!!

'l. Aten year old boy (26 kg) sits on a wheeled office chair (16 kg) holding a fire extinguisher (18 kg when empty). He points the discharge horn to the right and ejects 9 kg of carbon dioxide at 20 m/s, emptying the fire extinguisher. What is his speed and direction after the fire extinguisher is emptied (assuming friction is negligible)? A group of students are performing an experiment in class using collision carts on a track. An 8.0 kg cart moving to the right at 4.0 m/s hits a 4.0 kg cart moving to the left at 6-0 m/s- Immediately after the collision, the 4.0 kg cart moves to the right at 3.0 mls. What are the speed and direction of the 8.0 kg cart after the collision