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     EduGorilla 
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    In which of the following cases is the work done said to be zero?

    (a) When force is perpendicular to displacement
    (b) When force = 0
    (c) When force 0 and displacement 0 and force is not perpendicular to displacement
    (d) When force is parallel to displacement

    Options :-

    1. Both (b) and (d)
    2. Both (a) and (b) 
    3. Both (a) and (c) 
    4. Both (c) and (d) 
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