Helping with physics problems!

I have always argued with my brothers as to who is the smartest kid in the family. Now, being a senior in high school and taking hard classes such as AP-C Physics and BC Calculus, I can see where they were coming from. However, just 2 days ago, my older brother called me asking for help on a physics problem!!! It was relatively easy for me, but it was one of the first homework assignments he had for the physics course he was taking in college. It dealt with projectile motion and velocity at certain given points of a moving hot air balloon. The balloon was moving up at a constant velocity, while someone in the balloon dropped a sandbag. The rate it was rising must have been greater than the weight of the sandbag because it was dropped from 40m but that wasn't it's maximum displacement. It was a different problem than we have encountered in class, but after thinking it through, and using important formulas such as vf=vi+at and vf^2=vi^2+2ax, I was able to help him get the correct answers. Before I helped him, of course I made fun of him for asking his 'little sister' for help Physics is everywhere and having simple knowledge can help not only you, but others too!