23. On the moon, all free-fall distance functions are of the form s(t) = 0.81t2, where t is in seconds and s is in meters. An object is dropped from a height of 350 meters above the moon. After 5 sec, consider parts (a) through (d) below. a) How far has the object fallen? b) How fast is it traveling? c) What is its acceleration? d) Explain the meaning of the second derivative of this free-fall function. a) The object has fallen m. (Type an integer or decimal rounded to two decimal places as needed.) m b) The object is traveling sec (Type an integer or decimal rounded to two decimal places as needed.) m c) The object's acceleration is sec' (Type an integer or decimal rounded to two decimal places as needed.) d) Choose the correct answer below. O A. It is the gravitational velocity for the moon. O B. It is the gravitational constant for the moon. O C. It is the gravitational force for the moon