# Science:Math Exam Resources/Courses/MATH110/December 2015/Question 05 (c)/Solution 1

According to the Hint, it is enough to check the sign of at .

From the part (b), we have , and therefore, is increasing at .

**Answer** :

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According to the Hint, it is enough to check the sign of $v=h'$ at $t={\frac {\pi }{6}}$.

From the part (b), we have $v\left({\frac {\pi }{6}}\right)=0.1>0$, and therefore, $h$ is increasing at $t={\frac {\pi }{6}}$.

**Answer** : $\color {blue}moving\ up$

- This page was last edited on 14 November 2017, at 07:40.