Should teenagers help their parents do chores? Is it important for us to learn how to do chores?
I have a classmate called Li Ting. She is the only child in her family. Her parents love her so much that they don’t let her do any chores. On weekdays she gets up, has meals, goes to school, has lessons, she only plays with her friends. So she doesn’t know how to do chores. One day, her father was badly ill and was in hospital. Her mother had to take care of her father in the hospital and couldn’t cook meals for her for a week. Li Ting didn’t know how to cook meals. She had a lot of trouble cooking meals and often felt hungry. She only had instant noodles(方便面)for her meals.
From the story, we know it’s very important for us to learn to do chores.

如图所示，用一动滑轮竖直提升质量分别为2m和m的两物块，初始时刻两物块A和B均静止在水平地面上，细绳拉直，在竖直向上拉力F=6mg作用下，动滑轮竖直向上加速运动，已知动滑轮质量忽略不计，动滑轮半径很小，不考虑绳与滑轮之间的摩擦，细绳足够长，则在滑轮向上运动过程中，物块A和B的加速度分别为（   ）