Which requires more work( in Joule) a block of 20 kg need to lift 20m or a block of 40 kg need to lift 10m.

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Solution

Energy required for a block of 20kg to lift 20m = mgh = 20 × 10 × 20 = 4000J

Energy required for a block of 40kg to lift 10m = mgh = 40 × 10 × 10 = 4000J

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

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