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ICSE Class 10 Physics 2013 Solved Paper

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A coolie is pushing a box weighing 1500N up an inclined plane 7.5m long on to a platform, 2.5m above the ground.
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Question : 37
Total: 70
In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
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