总质量为80 kg的跳伞运动员从离地500 m的直升机上跳下,经过2 s拉开绳索开启降落伞,图所示是跳伞过程中的v-t图象,试根据图象求:(g取10 m/s2)(1)t=1 s时运动员的加速度和所受阻力的大小;(图像过(2、14)这个点)(2)估算14 s内运动员下落的高度及克服阻力做的功.(阻力做功的答案保留三位有效数字) The children were warned
of not being too _______ about things you are not supposed to know.
A.strange B.amusing C.curious D.satisfied