A system consists of two blocks, of masses m and 2m, attached to the ends of a mass less spring with a force constant k. The system is placed on a horizontal friction-less surface. Initially, the spring is relaxed. The blocks are then pulled apart an "extra" distance x and simultaneously released from the state of rest.
When the spring is relaxed again, what statement about the blocks' instantaneous speeds is correct?
Block m has a greater speed
Block 2m has a greater speed
Both blocks have zero speed
Both blocks have equal non-zero speed