In a lab investigation, one group of students (group A) measures the speed of a 0.1kg car at 2.5m/s at the bottom of a hill. Another group of students (group B) measures the speed of the car at 3m/s at the bottom of the hill. Both cars started at the top of a hill that is 1m high. Calculate the potential and kinetic energies for each group's car.

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.