The following data were obtained while dropping a metal ball near Earth’s surface:
Time t (s): 0, 1, 2, 3
Velocity v (m/s): 0, 9.8, 19.6, 29.4
From the slope of the v–t graph, the acceleration of the ball is approximately
(a) 14.7m/s2
(b) 9.8m/s2
(c) 4.9m/s2
(d) 19.6m/s2