Hi can you help me with 3,4,8,10 please cuz I have no clue how to do it thanks

An object thrown into the air stops at the highest point in its path. Is it in equilibrium at this point? Explain. What physical quantity is a measure of the amount of inertia an object has? For problems 10-12, see Sample Problem B. 10. Four forces act on a hot-air balloon, shown from the side in the figure. Find the magnitude and direction of the resultant force on the balloon. 5120 N 1520 N 950 N 4050 N8. A chair is pushed forward with a force of 185 N. The gravitational force of Earth on the chair is 155 N downward, and the oor exerts a force of 155 N upward on the chair. Draw a free-body diagram showing the forces acting on the chair