Ajanitor standing on the top floor of a building wishes to determine the depth of the elevator shaft. they drop a rock from rest and hear it hit bottom after 2.42 s. (a) how far (in m) is it from where they drop the rock to the bottom of the shaft? the speed of sound at the temperature of air in the shaft is 336 m/s. (round your answer to at least three significant figures. use g = 9.80 m/s2 as needed.) m (b) if the travel time for the sound is ignored, what percent error is introduced in the determination of depth of the shaft? %