Arock is thrown straight downward from a tree limb with an initial velocity v0. the rock has constant downward acceleration of 10 m/s2 during its fall. the rock moves 7 times as far during the first 3 seconds as during the first 1 second of fall. what is the value (magnitude only) of v0?

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.