How Does Changing Mass and Speed Affect Spring Compression?

[bcalkins]

Question: A block of mass m and speed v collides with a spring, compressing it a distance deltaX. What is the compression of the spring if the mass of the block is halved and its speed is doubled?

I have no idea how to do this problem. If anyone can explain this to me it would be GREATLY appreciated. Thank you!

 

[Villyer]

Have you attempted to use conservation of energy principles?