What is the best explanation of the main difference between a rock and a mineral? A) Minerals are organic; rocks are inorganic.
B) Rocks are naturally occurring; minerals do not occur naturally.
C) Rocks are crystalline solids; minerals are not crystalline solids.
D) Minerals have a definite chemical composition; rocks do not have a definite chemical composition.

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

The slope of a velocity time graph over any interval of time gives the during that interval

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