Question

a person pushes a block of mass 'M' by applying a certain force 'f' through a distance 's' if the friction force between surface and the block is f/6 then the efficiency of the person is this process is -
1. 94 %
2. 83.33%
3. 33.33%
4. 66.66%

Answer 1

ans is option b )83.33% as 1/6 energy is wasted in work against friction
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