problem

Feb 2018
7
0
Can anybody help me with the problem in the attached file? what are the pj.pk, xk? Also the idea following to solve the problem?
 

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Apr 2015
1,035
223
Somerset, England
Aren't the suffixes j and k just marking the other two directions orthogonal to the i direction and each other.

so pj and pk are components of momentum p in the j and k directions and xk is the position vector in the k direction.
 
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