After the explosion, the individual parts of the system (that is often a collection of fragments from the original object) have momentum. In an explosion, an internal impulse acts in order to propel the parts of a system (often a single object) into a variety of directions. This same principle of momentum conservation can be applied to explosions. For collisions occurring in isolated systems, there are no exceptions to this law. As discussed in a previous part of Lesson 2, total system momentum is conserved for collisions between objects in an isolated system.
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