M5. On another planet, a simple pendulum is constructed that has a string of variable length L For various lengths, the period T of the pendulum is measured. The graph shows the square of the period plotted versus the pendulum's length. What is the approximate acceleration of gravity on this planet? (D) Fastest speed attained by the oscillating object (A) 0.4 m/s2 (B) 1 m/s2 (C) 2.5 m/s2 (D) 4 m/s2