Fitts’s law is used to estimate the amount of time it takes for a person, using his or her arm, to pick up a light object, move it, and then place it in a designated target area. Mathematically, Fitts’s law for a particular individual is given by

where s is the distance (in feet) the object is moved, w is the width of the area in which the object is being placed, and T is the time (in msec).

(a) Calculate T(3, 0.5).
(b) Find T_s(3, 0.5) and T_w(3, 0.5) and interpret these values.

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T(s, w) = 105 + 105 + 265 log2 (²) W