You are running a race due north at 7 miles per hour. The person behind you is running at 8 miles per hour and is catching you. 12.From your perspective (you are the reference point) what is the velocity of the second runner?
13. From the second runner’s perspective (he is the reference point) what is your velocity?

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

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.