Observe the speedometer on the car. As the car moves, what is happening with the velocity?

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

What is a subatomic particle with a negative charge and very little mass?

Does heating a metal wire increase or decrease its electrical resistance? why?