英文物理,要英文答案,谢谢~

2024-12-24 16:59:59

推荐回答（5个）

回答1：

1.
The time he used for his first journey: 60 miles /60 mph = 1 hour
The time he used for his second journey: 60 miles / 75 mph = 0.8 hour
the average speed:
v = (60 miles + 60 miles) / (1 hour + 0.8 hour)=120 miles / 1.8 hours = 200/3 mph ≈ 66.7 mph

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回答2：

1。驾驶时沿固定每小时60（英里）的第一英里60英里，在一个恒定的最后75英里60英里的高速公路，埃德驱动器。什么是埃德的平均时速在他的旅程？提示：答案是不是60和七五英里每小时的平均水平。

回答3：

1) find out the total time cost, which equals the time spend in first 60 miles plus time spend in final 60 miles, the time duriation will be T= 60 miles / (60mph) + 60 miles / (75mph) = 1.8hrs
2) the total displacement equals first 60 miles + final 60 miles = 120 miles.
3) Average speed = total displacement / total time cost = 120 miles / 1.8hrs = 66.7mph

回答4：

这是物理题么？这不是数学题么
(60 + 60) ÷ (60 ÷ 60 + 60 ÷ 75) ≈ 66.67
英文答案是神马意思，英文数字么？

回答5：

(花在前60英里的时间)the time spent on the first 60 miles :60miles/60mph=1hour
（花在后60英里的时间）the time spent on the final 60 miles:60miles/75mph=0.8hour
（平均速度=路程/时间）the average speed on his journey：(60+60)miles/1.8hour=66.67mph