If nothing is impossible then is it possible for something to be impossible

In what direction does the medium move relative to the direction of the wave? explain.

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?