For the position-time graph shown below, determine the object's acceleration rate for the first 50 s. Assume the acceleration of the object to be constant. Position vs. Time 250 200 150 Position (d) in m [S] 100 50 20 40 60 Time (t) in s (0.1 m/s2 [S] 0.2 m/s2 [S] . . . 2.1 m/s2 [S] ( 1.2 m/s2 [S] For the position-time graph shown below, which of the following is the best measurement for the instantaneous velocity of the object at 6 s? 10 d (m) ONDO O 2 4 6 8 10 t (s) -5.9 m/s O-0.70 m/s O +0.98 m/s O+0.60 m/s