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If it's to lift 30 kg, it depends how far it is to be lifted and how quickly the lift takes to complete.
To lift 30 kg through 10 metres requires 30 x 9.8 x 10 joules of energy, that is 3000 Joules. To do that in 10 seconds needs 300 watts, which would be about half a horse power motor. To do it in 5 seconds the power would be 600 watts - a 1 horse power motor.
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One HP equals 746 watts. So 4 HP = 2984 watts.
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