题目

   The worst thing is the headlines. I use the underground almost every day and watch the people travel, their heads   1   in the newspapers. The headlines today   2   suicide (自杀) bombers and of horrific attacks that they say   3   by members of our community. Something on the journey is   4  . I am not   5   anything that would indicate I am a Muslim. I normally do not   6   it is Friday and I am on my way to prayers.   7   I sense an uneasiness in the carriage. People are   8  . No one is speaking and it must be said that no one is being   9 如图所示，质量为4.0kg的物体在与水平方向成37°角、大小为20N的拉力F作用下，沿水平面由静止开始运动，物体与地面间动摩擦因数为0.20；取g = 10m/s2，cos37°= 0.8，sin37°= 0.6；求： （1）物体的加速度大小； （2）经过2s撤去F，再经3s时物体的速度为多大？ （3）物体在5s内的位移是多少？