A steady, incompressible, two-dimensional velocity field is given by where the x- and y-coordinates are in meters

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A steady, incompressible, two-dimensional velocity field is given by

where the x- and y-coordinates are in meters and the magnitude of velocity is in m/s. The linear strain rate in the x-direction in s–1 is
(a) –1.6 

(b) 0.8 

(c) 1.6 

(d) 2.5 

(e) –0.875

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