Author Question: Air is composed mainly of A) N2 and O2. B) N2 and O3. C) O2. D) CO2 and O3. E) CO2 and ... (Read 32 times)

fox

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Air is composed mainly of
 
  A) N2 and O2.
  B) N2 and O3.
  C) O2.
  D) CO2 and O3.
  E) CO2 and O2.

Question 2

A ball rests in the middle of a cart. When you quickly jerk the cart forward, the ball
 
  A) hits the front of the cart.
  B) hits the back of the cart.
  C) remains in the middle of the cart.
  D) all, depending on how quickly the cart is pulled



millet

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Answer to Question 1

A

Answer to Question 2

Answer: B



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