Need this badly today

13. The straight post B rests upon the front edge of the car A as shown which is ascending the 300 incline with an acceleration of 0.5 m/s2.at what angle must the post be inclined in order that it will maintain its position?

Ito yung mga tipong post na hindi gustong sagutin ng mga contributors ng site na 'to. Observation ko lang sa past 6 years na pabalik balik ditto. Pag ganito title mo, wag ka na masyado umasa.