You do 45.0 joules of work and 3.00 seconds how much power do you use

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

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.

How do we measure or think of speed in the united states?