如图所示，质量为m₁=1kg的小物块P置于桌面上的A点并与弹簧的右端接触（不拴接），轻弹簧左端固定，且处于原长状态．质量M=3.5kg、长L=1.2m的小车静置于光滑水平面上，其上表面与水平桌面相平，且紧靠桌子右端．小车左端放有一质量m₂=0.5kg的小滑块Q．现用水平向左的推力将P缓慢推至B点（弹簧仍在弹性限度内）时，撤去推力，此后P沿桌面滑到桌子边缘C时速度为2m/s，并与小车左端的滑块Q相碰，最后Q停在小车的右端，物块P停在小车上距左端0.5m处．已知AB间距离L₁=5cm，AC间距离L₂=90cm，P与桌面间动摩擦因数μ₁=0.4，P、Q与小车表面间的动摩擦因数μ₂=0.1，（g取10m/s²），求：

阅读下面材料，在空白处填入适当的内容或括号内单词的正确形式。

    There are all kinds of festivals throughout the world. Festivals are held____ (satisfy) and please the ancestors, to honor some famous people or important____(event), and to express people's gratitude to the God for bringing them a year of plenty. For example, in India, October 2 is ____national festival to honor  Mahandas Gandhi, the leader____helped gain India's ____(depend) from Britain.____ (tradition), in China the Spring Festival, which ____(celebrate) in January or February, is the most ____(energy) and important because it is a festival that looks forward____the coming of spring. Why are all these festivals everywhere? Because during the festivals, people can get together to eat, drink and have fun with each other,____ (forget) all the daily struggle and demands for a while.

把一个圆分割成三个扇形，它们圆心角的度数比为1：2：3，求最大的扇形的圆心角的度数．

- Is Tim Emma's brother? （   ）

- Yes, he________.