A small weather balloon of weight 3.5 N3.5\text{ N}3.5 N is falling vertically through the air at terminal velocity. A sudden gust of wind exerts a horizontal force of 1.2 N1.2\text{ N}1.2 N on the balloon to the east. What is the magnitude and direction of the resultant force acting on the balloon while the wind is blowing?
245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.