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A vector. Acceleration is defined as change in velocity in a given time, in symbols

a = ( v - u ) / t

(the bolded symbols represent vectors)

t is a scalar so its inverse is also a scalar.

( v - u ) is a vector so

a = vector * scalar = a vector.

Answer2:

Acceleration like many quantities is a Quaternion, consisting of a scalar part and a vector part. a= mv2/r is a scalar acceleration and A=dV/dt is a vector acceleration as is cV/r = A.

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