The mass of the Moon is 7.4 1022 kg, its radius is 1.74 103 km, ...

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The mass of the Moon is 7.4  1022 kg, its radius is 1.74  103 km, and it has no atmosphere. What is the acceleration due to gravity at the surface of the Moon? (G = 6.67  10-11 N  m2/kg2)
 
  A) 2.8  106 m/s2
  B) 9.8 m/s2
  C) 4.9 m/s2
  D) 1.6 m/s2
  E) 0.80 m/s2

Question 2

A baseball is hit with a bat and, as a result, its direction is completely reversed and its speed is doubled. If the actual contact with the bat lasts 0.45 s,
 
  what is the ratio of the magnitude of the average acceleration of the ball to its original speed?
  A) 6.7 s-1
  B) 4.4 s-1
  C) 2.2 s-1
  D) 0.15 s-1

[ecabral0]

Answer to Question 1

D

Answer to Question 2

A

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Excellent

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Gracias!