How much work does it take to raise a #9 kg # weight #9 m #?

2 Answers
Jane
Mar 6, 2018

#793.8 J#

Explanation:

Here work will be done against the gravitational force,which supplies the required amount of potential energy for the weight to be #9m# above the ground.

So,work done=#mgh=9*9.8*9=793.8 J#

Junaid Mirza
Mar 7, 2018

#"793.8 Joule"#

Explanation:

#"Work = Change in Potential energy"#

#W = U_f - U_i#

#W = "mgh"_f - "mgh"_i#

#W = "mg"(h_f - h_i)#

#W = "9 kg" × "9.8 m/s"^2 × ("9 m" - "0 m")#

#W = "793.8 Joule"#

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