Your performance on the pacer is used to measure which components of health- related fitness?

Anton created a chart listing different types of materials. which best complete the chart? (a)x: copper y: glass(b)x: rubber y: copper(c)x: paper y: silicon(d)x: silicon y: glass

In what direction does the medium move relative to the direction of the wave? explain.

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body