A plank with a box on it at one end is gradually raised about the other end.As the angle of inclination with the horizontal reaches
30o , the box starts to slip and slides
4m down the plank in
4s. The coefficient of static and kinetic friction between the box and the plank will be respectively
![1076663_c2fc0104e7084b6eaa7274d627bb81a7.png](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/1076663_c2fc0104e7084b6eaa7274d627bb81a7.png)