Ned (40kg) and Ed(54kg) are twins. Ned runs up stairs (6m high) in 3 s...
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Ned (40kg) and Ed(54kg) are twins. Ned runs up stairs (6m high) in 3 s while Ed walks up the same stairs in 7s. Who did more work? Ed did less work because it took him more time to travel the 6m of vertical height. Neither twin did any work. Ed did more work because he has more mass and travelled the same distance as Ned.
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