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In a certain decay reaction, a parent nucleus undergoes alpha decay, and the two products of the decay are a daughter nucleus and an alpha particle. The parent nucleus is stationary before the decay occurs, and the two products move off in opposite directions after the decay.

The two decay products must have equal magnitudes of which one of the following as they move off after the decay?

A

Kinetic energy.

B

Speed.

C

Momentum.

D

Mass.

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