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Jelly, 8 bytes

ḲOr97ỌKY

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ḲOr97ỌKY - a monadic link taking a string, e.g. "ab c"
Ḳ - split at spaces --> ["ab", "c"]
 O - get ASCII codes --> [[97, 98], [99]]
 r97 - build descending range to 97 --> [[[97], [98, 97]], [[99, 98, 97]]]
 Ọ - turn back into ASCII --> [["a", "ba"], ["cba"]]
 K - join with spaces --> ["a", "ba", " ", "cba"]
 Y - join with linefeeds