When they stick together, the combined objects will have 1/2 the velocity of the one that was moving. Why? It Lost Energy

Momentum is conserved, so they both move at the same velocity no matter the mass

Momentum is conserved, and proportional. To increase mass means to decrease velocity by the same proportion.​

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.