Richard walks from his home to his school at a constant speed. it takes him 4 min to travel 100 m. which of the following lines in the following distance-time graph could show Richard's motion on the way to school?

Since his speed is constant,

B.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

k2s for potassium sulphide