What is the mass of a ball moving at 4 m/s with a momentum of 48 ...

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What is the mass of a ball moving at 4 m/s with a momentum of 48 kgm/s?
 
  A) 4 kg
  B) 12 kg
  C) 48 kg
  D) 192 kg
  E) none of the above

Question 2

You are in distant space, where there is no gravity. You hold two blocks of metal. They look and feel identical when touched, but you been informed that one is made of lightweight aluminum and the other of lead.
 
  Can you determine which one is lead without doing any kind of chemical analysis?
  A) You can determine this by dropping them; the lead ball will fall fastest.
  B) You can determine this by dropping them; the aluminum ball will fall fastest.
  C) You can determine this, by tapping each block with your finger; the one that accelerates the most is aluminum.
  D) You can determine this by giving each block a tap with your finger; the one that accelerates the most is the lead.
  E) The above methods will not work.

[pallen55]

Answer to Question 1

Answer: B

Answer to Question 2

C

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Gracias!

[mochi09]

Excellent