What type of contraction is represented by each of the following events? options are either isotonic eccentric contraction or isotonic concentric contraction. a) a weight lifter puts a barbell back on the floor. b) a weigh lifter pulls a barbell up to his waist. c) a mother lowers an infant into his crib. d) a man pulls open a door for his date. e) a sprinter leaves the starting block.
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