This is my gr. 11 physics problem that I can't get. I would be very grateful if someone could help me. A hot air balloon has a force of gravity of 3000N but has an upward force of 3800N due to the hot air. Person A is on the ground and pulling the balloon with a force of 540N [Left 40degree Down]. Person B is pulling with a force of 700N straight down. Person B's rope is 30m long. How long will it take to pull the balloon down. The problem is #52 from p148 of Irving Physics and the answer is 7.5 seconds but I have no idea how they got it there. Thanks for any help you might give!(adsbygoogle = window.adsbygoogle || []).push({});

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Balloon FreeBodyDiagram Question

**Physics Forums | Science Articles, Homework Help, Discussion**