In a physics lab experiment, a spring clamped to the table shoots a 22g ball horizontally. when the spring is compressed 21cm , the ball travels horizontally 5.0m and lands on the floor 1.7m below the point at which it left the spring.
what is the spring constant?
express your answer using two significant figures.

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.