4. a 75 kg bobsled is pushed along a horizontal surface by two athletes. after the
bobsled is pushed a distance of 4.5 m starting from rest, its speed is 6.0 m/s. find
the magnitude of the net force on the bobsled.

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

Positive ions differ from neutral atoms in that

(asap) uneven heating of the earth's surface is due primarily to the position of the equator, north pole, sun, or moon?