How much work does it take to raise a #2 kg # weight #18 m #?

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Answer 1 · 2015-12-10T03:20:38

It will require #"400 J"#.

#"work"="force"xx"distance"#

#"F"_"weight"=mg"#

Given/Known
#m="2kg"#
#g="9.81 m/s^2"#
#h="18 m"#

Solution
Determine #"F"_"weight"#.

#"F"_"weight"=2"kg"xx9.81"m/s"^2="19.62 N"#

I am keeping some guard digits to reduce rounding errors. I will round the final answer to one significant figure.

Calculate work.

#"work"=19.62"N"xx18"m"="400 J"# (rounded to one significant figure)