Question: Plot of portion of line integral along Curve

At my first steps in vectorcalculus i calculating a scalar line integral, but the concept how to do this is not  yet clear to me 

ecxample_4_-_blz407_toegepaste_wiskunde.mw

https://drive.google.com/file/d/1K5mnfCAB_zSzLGNNz1rkUyjvRhCgpFi4/view?usp=sharing

 

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