What are some examples of pure mixtures?

The man fires an 80 g arrow so that it is moving at 80 m/s when it hits and embeds in a 8.0 kg block resting on ice. how far will the block slide on the ice before stopping? a 7.1 n friction force opposes its motion.

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Which articulations allow for greatest range of motion?