Chapter 8249*P8.74(a)Conservation of energy for the sled-rider-Earth system,between A and C:KU K Ummmvvigifgf+=++=+=12259809761202980141222.....msmm2CC2bgejafFIG. P8.74(a)(b)Incorporating the loss of mechanical energy during the portion of the motion in the water,we have, for the entire motion between A and D (the rider’s stopping point),KU fxK Uikfgf+−∆:12802 5809 809 760 02kgm skgm sm2bgaf.=+fxk∆−=−×k∆790 103. J(c)The water exerts a frictional forcefxk=×=×⋅=7 90 107 90 1015833J Nm50 mN∆and also a normal force ofnmg===809 80784kgm sN2.The magnitude of the water force is15878480022N NN(d)The angle of the slide isθ°−sin..110 4m54.3 mFor forces perpendicular to the track at B,
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