question_answer

To what height should a box of mass 150 kg be lifted, so that its potential energy may become 7350 joules? (\[\text{g}=\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\])

Answer:

Given, \[m=150\,kgP.E.=7350\,J\] \[g=9.8\,\,m/{{s}^{2}}h=?\] We know, \[P.E.=mgh\Rightarrow h=\frac{P.E.}{mg}\] \[\therefore h=\frac{7350}{150\times 9.8}=5\,m\]