题目出自 Harris Benson
CH1 p53
61.
A juggler has three oranges that rise 1.8m above his hands.
He takes 0.3s to transfer an orange from one hand to the other.
When one orange is at its maximum height,where are the other two?
Assume they are equally spaced in time.
我不太懂 0.3s 这条件该怎么使用
恳请指教