A20 kg mass is dropped from a tall rooftop and accelerates at 9.8 m/s2. what is the weight of the dropped object?

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

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.