Carriage Wall

Train – jumping?
Why is it that if you jump in the air while travelling in a fast-moving trainyou are not thrown back against the carriage wall? Or if you throw a ball in the air whilst travelling on same said fast-moving train it behaves as though you were outdoors in the park? Is gravity relative to the space you are occupying?
nothing to do with gravity
in either case, you and the ball have a forward momentum that is relative to the train
there is no force present to alter that momentum
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