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                                    A block of mass 2kg slipped up a slant planerequires 300J of work. If height of slant is10m the work done against friction is -(A) 100JQ.2(B) 200J(D) zero(C) 300 | 
                            
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Answer»  Work must be done againstfriction as well as gravity.The work done against gravity is change in potential energymgh=2×10×10=200JThe remaining work done againstfriction is 100J. thanku  | 
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