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Answer 1 · 2017-10-14T10:51:47

Work done = potential energy gained (in this case, GPE)

GPE#= mgh#

#=20kg times 9.8m/s^2times 30 m#

#=5880J#

Power #="Work"/"Time taken"#

#=(5880J)/(10s)#

#=588 "watts"#