The speed of a train is decreased in a uniform rate from 96km/h to 48km/h through a distance of 800 m due to using the brake .calculate the distance covered by the train from the moment of using the brake till it stop ,if it was moving with the same acceleration .

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.