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Ayushree
Ayushree
Asked: September 12, 2026In: Class 9 Science

A crane lifts a mass m to the 10th floor of a building in a certain time. It then raises the same mass to the 20th floor of the same building in double the time. How much more energy and power are required? Assume that the height of all floors is equal.

Lifting to the 20th floor requires twice the energy because the vertical height is doubled. However, since the time taken is also doubled, the power required remains exactly the same as before.

chapter 7 workclass 9 science chapter 7 workcrane lifts a mass m to the 10th floor of a buildingenergy and simpleenergy and simple machines solutionsenergy and simple question answermuch more energy and power are requiredncert solutions – workraises the same mass to the 20th floor of the same building
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