# Answer to Question #84453 in Classical Mechanics for Lauren

Question #84453

A flea walking along a ruler moves from the 45 cm mark to the 27 cm mark.What is the displacement? (Define increasing numbers to be the positive direction and decreasing numbers to be the negative direction.)

Expert's answer

The displacement of a flea

s_x=x_f-x_i

=27-45=-18 cm

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