(A) Composite solid propellants are used in rocket engines. These consist of a fuel and an oxidizer. The fuel is typically a polymer like $Polyurethan

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Polyurethane or polybutadiene and ammonium perchlorate

(A) Composite solid propellants are used in rocket engines. These consist of a fuel and an oxidizer. The fuel is typically a polymer like $Polyurethane$ or $polybutadiene$,and the oxidizer is an inorganic salt,most commonly $Ammonium \ perchlorate$ $(NH_4ClO_4)$.