Question

One man takes 1 minute to raise a box to a height of 1 metre and another man takes $\frac { 1 } { 2 }$minute to do so. The energy of the two is:

• A. Different
• B. Same
• C. Energy of the first is more
• D. Energy of the second is more

Answer 1

Answer: (B)

Same

Answer 2

Energy required = mgh. In both cases, h is the same Hence, energy given by both is same. [It is worth noting here that powers of two men will be different as power is the energy expense par unit time and times are different here.