Physics

Problem

4\,\text{kg}

box is lifted slowly from a height of

1.2\,\text{m}

3.5\,\text{m}

. Take

g = 9.8\,\text{m s}^{-2}

. The work done by gravity during this lift is closest to a)

+9.0\times10^{1}\,\text{J}

-1.4\times10^{2}\,\text{J}

-9.0\times10^{1}\,\text{J}

-4.5\times10^{1}\,\text{J}