题目

英文
two friedns see each other in a grocery store.initially,they are 50m apart .the first friend starts walking toward the second friend at a constant speed of 0.50m/s.At the same instant,the second friend accelerates uniformly from rest at a rate of 1.0m/s toward the first friend.how long before the two friends can shake hands?

提问时间：2020-08-01

答案

我英语也很烂 不过大概看懂了 就是说两个朋友在一个食品店互相看到对方,他俩距离50米,然后一个人像另一个人走去,速度是固定的0.5米每秒.同时另一个人就从静止开始加速速率为1米每秒向第一个人走去.问多久两人能握手....