1. The problem statement, all variables and given/known data Launch a .8 kg ball from a spring cannon in order to hit a target 25m away, the cannon fires at 45 degrees relative to the ground, what is the initial velocity necessary for the ball to make the distance. spring constant is 425 N/m. 2. Relevant equations fspring=-kx 3. The attempt at a solution I really don't know how to get started on this.