Question

a

Answer 1

Hmm, well think of total velocity as a function of x and y

Answer 2

so the combination of the partial derivatives forms the new eq

Answer 3

no it's vector notation

Answer 4

usually in this case

Answer 5

This is a little technical, but a good overview http://math.ucsd.edu/~wgarner/reference/math10c_su10/lectures/second-order_partial_derivatives.pdf

Answer 6

np best of luck, but anyways, just think of vector notation and it should help too

Answer 7

awesome! have a good night