1. no they didn't both move smoothly except for block A because the underside of it is smooth.
block B didn't move smoothly because the underside of it is a sand paper.
2.block A because the underside of it is smooth
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Answers & Comments
1. no they didn't both move smoothly except for block A because the underside of it is smooth.
block B didn't move smoothly because the underside of it is a sand paper.
2.block A because the underside of it is smooth