Someone me with these symbols?

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SUMMARY

The discussion centers on the interpretation of the symbols (v_A)_2x and (v_(Ax))_2 in the context of impact physics for engineering. The participants clarify that (v_A)_2 represents the final velocity of object A after a collision, while (v_A)_2x denotes the x-component of this final velocity. Both terms are confirmed to be equivalent, indicating that they can be used interchangeably in calculations involving momentum conservation in collisions.

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Homework Statement



I'm doing an impact physics for engineering question and I cannot tell the difference between

(v_A)_2x & (v_(Ax))_2.

* I don't think I'll need help with solving the actual question if I understand these variables.

Homework Equations



N/A

The Attempt at a Solution



I know that v_A is object A's initial velocity, however, I don't know how to deal with the _2x. As for the second term above, I have no idea...
 
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c0nfused34235 said:

Homework Statement



I'm doing an impact physics for engineering question and I cannot tell the difference between

(v_A)_2x & (v_(Ax))_2.

* I don't think I'll need help with solving the actual question if I understand these variables.

Homework Equations



N/A

The Attempt at a Solution



I know that v_A is object A's initial velocity, however, I don't know how to deal with the _2x. As for the second term above, I have no idea...

Welcome to the PF.

Can you post a picture or scan of the use of those symbols?
 
welcome to pf!

hi c0nfused34235! welcome to pf! :smile:

(try using the X2 button just above the Reply box :wink:)

you mean (vA)2x & (vAx)2 ?

what is the context? :confused:​
 
Hi guys, thanks for the warm welcome and quick replies. Here's the question and it's solution. I was trying to figure it out (how they solve it) and I could not understand how they found the 2 variables in the red box (see image attached below). Thanks again.
 

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(v_A)2 is the final velocity of body A, i.e., its velocity after the collision

(v_A)_2x is the x-component of body A's final velocity after collision

(v_(Ax))_2 is the after collision value of A's x-component of velocity

The sum of the x-components of momentum of the system before and after the bodies collide remains constant. The same goes for the y-components of momentum.
 
hi c0nfused34235! :smile:
c0nfused34235 said:
… I could not understand how they found the 2 variables in the red box (see image attached below).

(vA)2x and (vAx)2 are the same

(i've no idea why they've done that :redface:)

so they just add (vA)2x + (vB)2x to (vA)2x - (vB)2x to get 2(vA)2x

(and subtract to get 2(vB)2x) :wink:
 
Could someone please solve for one of them (with steps)? I still don't understand how they solve for those variables. If they are indeed identical, why can't I substitute one set into the other formula? I get completely incorrect values.
 
Last edited:
YES I GOT IT!

Thanks for your help guys!
 

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