A particle moves with position function 
Find the normal component of the acceleration vector.
Definitions:
Open Sentence
A statement or expression containing one or more variables that can produce a truth value only when values are assigned to the variables.
Singular
Refers to something that is unique, individual, or one of a kind.
Open Sentence
A mathematical statement containing one or more variables where its truth value depends on the values assigned to its variables.
Open Sentence
A statement or equation that contains one or more variables, which makes it neither true nor false until the variables are specified.
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