velocity is contravariant tensor becasue displacement tensor is contravariant.
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A zero tensor is a tensor with all entries equal to zero.
A vector is a group of numbers in one dimensions; if you have such arrangements of numbers in more than one dimension, you get a tensor. Actually, a vector is simply a special case of a tensor (a 1st-order tensor).
riemann tensor=0 where R=Riemann tensor 0=the surface is flat
A scalar, which is a tensor of rank 0, is just a number, e.g. 6 A vector, which is a tensor of rank 1, is a group of scalars, e.g. [1, 6, 3] A matrix, which is a tensor of rank 2, is a group of vectors, e.g. 1 6 3 9 4 2 0 1 3 A tensor of rank 3 would be a group of matrix and would look like a 3d matrix. A tensor is the general term for all of these, and the generalization into high dimensions.
Yes. Zero velocity is a velocity; if it is always zero then it is a constant velocity.