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17 July, 02:48

A rock of mass m is twirled on a string in a horizontal plane. The work done by the tension in the string on the rock is:

a. + (positive)

b. - (negative)

c. 0

+1
Answers (1)
  1. 17 July, 02:55
    0
    Answer: c) 0

    Explanation:

    Work tension is zero because in any infinitesimal time interval, the tension force is directly perpendicular to the displacement.
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