Answer
$-2cm$
Work Step by Step
Given equation is $y=6.0sin(0.020\pi{x}+4.0\pi{t})$
putting $x=3.5 cm$ and $t=0.26s$ , we get
$y_{(3.5 cm, 0.26s)}=6.0 sin(0.020(3.14)(3.5)+4.0(3.14)(0.26)$
$y_{(3.5 cm, 0.26s)}=-2cm$
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