A skier of mass 60.0 kg starts from rest at the top of a ski slope of height 63.0 m.
(a) If frictional forces do −1.04×10^4 J of work on her as she descends, how fast is she going at the bottom of the slope?
Take free fall acceleration to be g= 9.80 m/s^2 .
(b) Now moving horizontally, the skier crosses a patch of soft snow, where the coefficient of friction is Mu_k= 0.150 . If the patch is of width 60.0 m and the average force of air resistance on the skier is 170N , how fast is she going after crossing the patch?
(c) After crossing the patch of soft snow, the skier hits a snowdrift and penetrates a distance 2.50 into it before coming to a stop. What is the average force exerted on her by the snowdrift as it stops her?
2007-02-13 19:38:34 · 1 answers · asked by M 1 in Science & Mathematics ➔ Physics
a. 27.7 m/s
b. 15.9 m/s
c.3021 N
2007-02-13 22:26:59 · answer #1 · answered by Maggiecat 3 · 0⤊ 0⤋