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Question

Work done by the gravitational force on a body of mass m moving on a smooth horizontal surface through a distance s is: (Given acceleration due to gravity =g):
  1. mgs
  2. mgs
  3. 0
  4. 2mgs

A
0
B
2mgs
C
mgs
D
mgs
Solution
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As the gravitational force is perpendicular to the distance moved by body, the work done by gravity will be zero.

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