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 thenet force acting on the ball when it reaches its maximumheight?What is the ball’s acceleration at this point?
问题描述：
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
When it reaches the summit,the net force is only gravity and no air resistance (since v=0).the instant acceleration is g.