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question in direction of flow in steady frame

I am looking at a solution of an engineering problem. There is a blast wave that moves through standard air conditions. The wave passes a stationary observer on the ground.
The problems asks to calculate mach number and direction of flow

It calculates Mach 1 = 10 , Mach 2 = 0.387
then  finds u1 = 3557 , u2 = 0.38757

then it states : for stationary reference frame
V2 = u1 - u2 = 2935.1
calculates M2 = v2/a2 = 1.8270

thus V2 is directed to shock front

my question is : what is the reasoning behind this assumption that v2 is directed to shock front ?

Any input would be appreciated.
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1 Solution
There are parts of the question that I do not understand.
What does Mach 1 represent?   Mach2?
Is there a difference between V2 and v2?   What is a2?
It seems that the problem is considering some velocity in addition to that of the shock wave. Because you said the observer is stationary, what is that other velocity?
c_hocklandAuthor Commented:
Mach 1 is the upstream Mach  , Mach 2 is the downstream Mach .
Mach 2 = u2 / a

Mach 1 = u1 / a

hope it helps
hope it helps

some but not much. I still do not know
Is there a difference between V2 and v2?   What is a2?
and now I do not know what a is
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