Question

It is easier to roll a stone up a sloping road than to lift it vertical upwards because

• A. work done in rolling is more than in lifting
• B. work done in lifting the stone is equal to rolling it
• C. work done in both is same but the rate of doing work is less in rolling
• D. work done in rolling a stone is less than in lifting it

Answer 1

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

The work done in rolling body up a slope is less than the work in lifting it upward for same height.

$\therefore$ It is easier to roll a stone up a sloping rod than to lift it vertically upwards.