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What is more convenient rolling of stone on a sloping road than to lift it vertical upwards?

A. 

The work done in rolling a stone is less than in lifting it

B. 

The work done in both is same but the rate of doing work is less in rolling

C. 

The work done by the  rolling stone is equal to the lifting

D. 

Rolling is more convenient and more work done as compare to the  lifting

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Answer with explanation

Answer: Option A

Explanation

If you are lifting stone vertically upwards then you have to do work against the Gravitational force on stone i.e. ‘mg’ and displacement will be equal to h. Thefore work done = mg×h (f×s). … If you consider frictional force then rolling the stone will require less force than sliding against the frictional force.

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