1. The problem statement, all variables and given/known data A ball is launched at a speed of 10ms-1. It lands 5m away. Find the two possible values of the angle, θ, which the initial trajectory makes with the horizontal. 2. Relevant equations The equations of motion. 3. The attempt at a solution I realise that I need to find the angle θ and then use sin(180-θ) to find the other possible angle however I do not know how to get it.