A boy jumps at a speed of 20. 0 m/s at an angle of 25. 0° above the horizontal. What is the horizontal component of the boy's velocity?.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

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

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply