题目

My Life Hello，everyone．Nice to meet you．I am from Asia．I'm a 12-year-old boy．I live in a small village   1   Galand Village in India．I'd like   2   you something about a day in my life． I sleep out in my yard to stay cool because it is very hot．I always wake up early because the birds make a lot of noises．At 6 a．m．I'm already dressed and ready to  3  school．I usually wait for my little sister to go to school together．So I have to ask her to hurry up．Because she has the habit of drinking a glass of milk   4  school．By the way I like my school，every d高台滑雪运动员经过一段滑行后从斜坡上的O点水平飞出，斜坡与水平面的夹角θ=37°，运动员连同滑雪板的总质量m=50kg，他落到了斜坡上的A点，A点与O点的距离s=12m，如图所示．忽略斜坡的摩擦和空气阻力的影响，重力加速度g=10m/s2．（sin37°=0.6；cos37°=0.80）（1）运动员在空中飞行了多长时间？（2）求运动员离开O点时的速度大小．（3）运动员落到斜坡上顺势屈腿以缓冲，使他垂直于斜坡的速度在t=0.50s的时间内减小为零，设缓冲阶段斜坡对运动员的弹力可以看作恒力，求此弹力的大小．