The velocity of an object moving along a line is given by v= 2t- + 2 fu/s on the interval 1 sts 5. a. Divide the interval [1, 5] into subintervals, [1, 2], [2, 3], [3, 4], and [4, 5]. On each subinterval, assume the object moves at a constant velocity equal to the value of v evaluated at the midpoint of the subinterval and use these approximations to estimate the displacement of the object on [1, 5]. (See part (a) of the figure.) b. Repeat part (a) for n = 8 subintervals (see part (b) of the figure). Click the icon to view the figures. a. For n = 4 subintervals, the approximate displacement of the object is | ft. (Simplify your answer.)