I attached the problem.(adsbygoogle = window.adsbygoogle || []).push({});

In the solutions my professor posted, he stated that acceleration is 0 in all directions. thus he can use the equation

ar=r''-r*(θ')^2 to find r''=4.62.

where ar is the the acceleration in the direction of the dotted line r.

I don't understand how the acceleration can be 0. What about gravity? Isn't that acting in the r direction??

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# I attached the problem.In the solutions my professor posted, he

**Physics Forums | Science Articles, Homework Help, Discussion**