Treo con lắc đơn vào trần một ôtô tại nơi có gia tốc trọng trường g = 9,8 m/s². Khi ôtô đứng yên thì chu kì dao động điều hòa của con lắc là 2 s. Nếu ôtô chuyển động thẳng nhanh dần đều trên đường nằm ngang với gia tốc 2 m/s² thì chu kì dao động điều hòa của con lắc xấp xỉ bằng

A. 2,02 s

B. 1,82 s

C. 1,98 s

D. 2,00 s

Read the passage below and decide whether the statements are TRUE or FALSE?

Lan is a student. That is her family. There are five people in her family: her father, her mother, her sister, her brother and her. That is her father. He's forty years old. He is working as a doctor in the city hospital. That is her mother. She is thirty-five years old. She is a nurse. Her brother is fifteen years old. Her sister is six years old. They are students. Although everybody is busy with their job, they still gather together to share happiness and sorrow in their life.

Her mother is 35 years old.

A. True

B. False