If a free falling rock were equipped with a speedometer, by how much would it's speed readings increase with each second if it were on a planet where g= 20 m/s^2? would it be 60?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

Anybody wanna ? (picture included? )

Ineed the answer to question 1 , i’m desperate