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When a person is standing on earth, the ...

When a person is standing on earth, the treesand houses appera stationary to mim. However, when he is sitting in a running train all these obects appear to move in bakward direction. Why?

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For a person standing on earth, relative velocity of trees and houses with respect to person is zero. For a persong sitttong a runnning train, the relative velocity of trees and houses whith repect to person is negative
`[:. V_(TP) =v_(T) -u _(P) =0 =- v_(P)]`
That is why the trees and houses appear to move in bachward direction to a person sitting in a running train.
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