Question 1147700
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The circular linear velocity of the mass is  v = {{{2*pi*R*n}}} = 2*3.14*1.5*3 = 28.26 m/s.


The acceleration of the body toward the center of the circle is


    a = {{{v^2/R}}}.


Substitute the found value of "v" and the given value of "R" into the formula and calculate.
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By the way, the mass value is IRRELEVANT in this problem (!)