Which quantities are categorized as vectors or scalars?

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Fox_Hound
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Identify each of the quantities below as Vector or Scalar.
Speed of a train. (Vector)
Volume of a cube. (Scalar)
Acceleration of a rocket. (Vector)
Mass of a pint of milk. (Scalar)
Velocity of a train. (Vector)
Force of gravity. (Scalar)

I put my answers in parentheses but I am not really comprehending the definition of vectors and scalars.My homework won't give any hints of what i got wrong.Can somebody help me see where I am going wrong at.
 
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