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Some energy is produced in the explosion.
According to Newton''s second law of motion when the mass of a moving object decreases , then a force is genereted. Numerically, F= v dm/dt.When a shell is explode from a canon the mass of the shell decreases. As a result a force is produced which accelerate the shell( F= ma . another form of Newton''s second law). When the shell accelerate its velocity gradually increases and therefore K.E(.= 1/2 mv*2 ) also increases. Similar principle is used in rocket propulsion.