MCQOPTIONS
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				| 1. | 
                                    No work is done when | 
                            
| A. | a nail is plugged into a wooden board | 
| B. | a box is pushed along a horizontal floor | 
| C. | there is no component of force parallel to the direction of motion | 
| D. | there is no component of force normal to the direction of force | 
| Answer» E. | |