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A 18 kg object is lifted up a distance of 3.0 m. What was the work...

A 18 kg object is lifted up a distance of 3.0 m. What was the work the force of gravity did on the object? Report your answer in SI units, rounded to the nearest whole number.

Note that the sign (+ or -) does have physical significance and must be correct for your answer to be correct

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Answer #1

Mass =18kg

Distance lifted is h =3 meters

Work done by gravity = Fg.h

                              Fg = mg

                           W= mgh cosθ

θ =180° as gravity is downwords and direction of motion is upwords

              W= (18×9.81)(3)(-1)

            W= -529.74 N.m

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