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There is wind where the rose was,
Cold rain where sweet grass was,
And clouds like sheep
Stream o'er the steep
Grey skies where the lark was.
Nought warm where your hand was,
Nought gold where your hair was,
But phantom, forlorn,
Beneath the thorn,
Your ghost where your face was.
Cold wind where your voice was,
Tears, tears where my heart was,
And ever with me,
Child, ever with me,
Silence where hope was.
November by Walter de la Mare
I am wondering if these guys are able to be on time at all. Anyway, I wouldn't: it would take me too long to calculate all this stuff:
"Say you want to cross the street, but a car is coming down the street, although it is some distance away. You know how fast you can walk or run across the street. Having learned about 1-D general motion, you could decide whether it is safe to start across the street by applying that model: estimate the speed of the car, integrate to find its position vs. time, solve for the time it will take to reach your position; then use the model again to calculate how long it will take you to get safely across the street; then proceeding if this time is shorter than the length of time before the car reaches your position."