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    				| 1. | 
                                    A coolie X carrying a load on his head climbs up a slope and another coolie Y carrying the identicalload on his head moves the same distance on a frictionless horizontal platform. Who does more work. Explain the reason | 
                            
| Answer» SOLUTION :Coolie X does work against the FORCE of gravity while COLLIE T does no work because his DISPLACEMENT is normal to the force of gravity. | |