Choose the type of problem for the collision method

I know the striker velocity W and the value of shock wave velocity D in the target. I want to calculate the values of particle velocity and pressure in the target. [ NEXT ] I know the striker velocity W. I want to calculate the value of shock wave velocity D and other parameters in the target. [ NEXT ] I know the value of shock wave velocity D in the target. I want to calculate the velocity of striker W. [ NEXT ]