[填空题]
A wooden block is cut into two pieces, one 2k a)pbzwy+e+g be18fwit.k,;f-n kyt pkh three times the mass of the other. A depression is made in both faces of the cut, so-.ytpkk,nf ; k that a firecracker can be placed in it with the block reassembled. The reassembled block is set on a rough-surfaced table, and the fuse is lit. When the firecracker explodes, the two blocks separate and slide apart. What is the ratio of distances each block travels?
