1. What is the vertical acceleration of a projectile? 2. How does the vertical velocity of a projectile change throughout its motion?

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.