1. The problem statement, all variables and given/known data A 0.25 kg projectile is launched across a frictionless surface by a spring of spring constant k=1200 N/m. The block is then redirected up a 25 degree incline and sent through the air with the intent of clearing a 1.2 m high wall that is 4.0 m away from the end of the incline. The last 1.0 m along the incline is not frictionless, and has a coefficient of kinetic friction of 0.60. If the launch point (from end of incline) is 0.50 m above the horizontal surface, what is the minimum amount that the spring must be compressed for the projectile to clear the wall? (note: the velocity vector upon leaving the ramp will be parallel to the incline. I'm not sure how to go about solving for the next step of the problem. Any help would be greatly appreciated! 2. Relevant equations 3. The attempt at a solution I tried solving for the velocity needed to clear the wall from the end of the incline by using kinematic equations in the x and y direction. Just can't seem to grasp what heights to use and such. I am assuming once I can get the velocity needed from that point I can use energy conservation and account for the work done by friction. Starting from immediately after the mass has left the spring. Then from there I could possibly see what distance the spring must be compressed to give me that value. Is this correct at all?