How high should a box of mass 20kg is lifted to store energy of 10,000 J? (g=10m/s)​

Iwill give brainliest if you answer right : )

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f