Which requires more work (in Joules) a block of 20 kg lifted to height of 20m or a block of 40 kg lifted to height of 10m?

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Solution

Energy required to lift a block of 20kg to a height of 20m = mgh = 201020 = 4000J

Energy required to lift a block of 40kg to a height of 10m = mgh = 401010 = 4000J

So, energy required for both the process is same which is 4000J

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Which requires more work (in Joules) a block of 20 kg lifted to height of 20m or a block of 40 kg lifted to height of 10m?

Energy required to lift a block of 20kg to a height of 20m = mgh = 20*10*20 = 4000J Energy required to lift a block of 40kg to a height of 10m = mgh = 40*10*10 = 4000J So, energy required for both the process is same which is 4000J

Energy required to lift a block of 20kg to a height of 20m = mgh = 201020 = 4000J

Energy required to lift a block of 40kg to a height of 10m = mgh = 401010 = 4000J

So, energy required for both the process is same which is 4000J