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Homework Statement
solution:
Homework Equations
The Attempt at a Solution
I thought this question should use :
thank you
yecko said:The Attempt at a Solution
I thought this question should use :View attachment 230458, but the solution manual usedView attachment 230459 instead, which 1/2 is missing... may I know what the 1/2 account for and why doesn't we need to multiply the equation by 1/2 ?