A simple pendulum is 3.10 m long. (a) What is the period of simple harmonic motion for this pendulum if it is located in an elevator accelerating upward at 4.70 m/s?? (b) What is its period if the elevator is accelerating downward at 4.70 m/s 2? (e) What is the period of simple harmonic motion for the pendulum if it is placed in a truek that is aceelerating horizontally at 4:70 m/s? 2 ?