A piece of golden ornament has a mass of 90 grams and it occupies 5 cm3. Is the ornament of pure gold? Why? If it is impure, then is the foreign material heavier or lighter than gold? Give an argument in favor of your stand. [Pure gold has density of 19.3 gm/cm³]

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.