ICSE Class 10 Physics 2013 Solved Paper

A coolie is pushing a box weighing $1500 {\N}$ up an inclined plane $7.5 {\m}$ long on to a platform, $2.5 {\m}$ above the ground.

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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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