有一道英文的物理题求大神讲解
题目
有一道英文的物理题求大神讲解
A 1-kg ball is thrown straight up in the air.What is the
net force acting on the ball when it reaches its maximum
height?What is the ball’s acceleration at this point?
答案
When it reaches the summit,the net force is only gravity and no air resistance (since v=0).the instant acceleration is g.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
热门考点