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(a) At what values of [tex]\vartheta[/tex] is the vertical component r[tex]_{y}[/tex] of the position vector greatest in magnitude?

(b) At what values of [tex]\vartheta[/tex] is the vertical component v[tex]_{y}[/tex] of the particle’s velocity greatest in magnitude?

(c) At what values of [tex]\vartheta[/tex] is the vertical component a[tex]_{y}[/tex] of the particle’s acceleration greatest in magnitude?

a. How can radius have a vertical component? It's just a distance or would it be a displacement?

b. Isn't velocity always tangential to the circle so how would there be a y component? Or does he just mean when it points in the y direction like at zero and 180 degrees?

c. Would it be 90 degrees and 270 because it only has a vertical component?

Any help would be appreciated