Easy question, looking for quick help

  • #1
217
0
The weight of an object on the moon is one-sixth of its weight on Earth. The ratio of the
kinetic energy of a body on Earth moving with speed V to that of the same body moving with
speed V on the moon is:

A. 6:1
B. 36:1
C. 1:1
D. 1:6
E. 1:36

I did the calculations using KE = 1/2 mv2 and got A, but the answer is C. Any explanations? Thanks.
 

Answers and Replies

  • #2
Delphi51
Homework Helper
3,407
10
Using KE = 1/2 mv^2 you would get the same answer on the moon as on Earth. The formula has MASS in it, not WEIGHT. The mass of an object is the same on the moon as it is on Earth. The weight, F = mg, is different because the gravitation acceleration g is less on the moon.
 
  • #3
217
0
Wow, thanks for that! Such a silly mistake.
 

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