Final answer:
The EXPLODE command is used in CAD programs to split a solid polyline or block into separate line segments, allowing them to be edited individually.
Step-by-step explanation:
The command used to split a solid polyline or block into separate line segments in various CAD programs like AutoCAD is the EXPLODE command. When you type EXPLODE or access it through the modify toolbar, it breaks a composite object into its component parts. For example, a solid polyline composed of multiple straight lines or arcs will be separated into individual line segments and arcs that can be edited independently.
In AutoCAD, the command used to split a solid polyline or block into separate line segments is BREAK. To use this command, you would select the polyline or block you want to split, then specify the points where you want to divide it. AutoCAD will create separate line segments between those points, effectively splitting the polyline or block.