URGENT 50 points available: A rock falls off a cliff. After falling for 3.5 seconds, what is its speed a) 0.35 m/s b) 15.7 m/s c) 55 m/s d) 35 m/s​

What is magnetic flux? explain faraday's law of induction.

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.

It is really hard for me right know