以初速度v0平抛出一个质量为m的物体,抛出后t秒内物体的动量变化是多少?
Δp=Ft=mgt
因为合外力就是重力,所以Δp=Ft=mgt
接受义务教育的学生应承担的最基本义务是努力完成规定的学习任务。[ ]
Cheer up, Maria! You can also enjoy _____ you have been dreaming of, if you don't lose heart. [ ]
A. as a convenient life as
B. as convenient a life as
C. as a life convenient as
D. convenient as a life as