60.0 kg downhill skier is moving with a speed of 10.0 m/s as she starts her descent from a level plateau at 150.0 meters of height above the

Question

60.0 kg downhill skier is moving with a speed of 10.0 m/s as she starts her descent from a level plateau at 150.0 meters of height above the base of the slope below. The length of the slope is 650 meters. There is a frictional force of 70 N affecting the skier’s motion while she coasts the entire descent without using her poles. Upon reaching the bottom she continues to coast to a stop. How much kinetic energy will she have at the bottom of the hill?

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niczorrrr 7 months 2021-08-01T11:29:07+00:00 1 Answers 5 views 0

Answers ( )

  1. Giakhanh
    0
    2021-08-01T11:30:50+00:00
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    Answer:

    She will have kinetic energy at the bottom of the hill=45700 J

    Explanation:

    We are given that

    Mass, m=60 kg

    Speed, v=10 m/s

    Height, h=150 m

    Length of slope, d=650 m

    Frictional force, f=70 N

    We have to find the kinetic energy she will have at the bottom of the hill.

    Kinetic energy  at the bottom of the hill

    =Initial kinetic energy+ mgh-fd

    Substitute the values

    Kinetic energy  at the bottom of the hill

    =\frac{1}{2}(60)(10)^2+60\times 9.8\times 150-70\times 650

    =45700J

    Hence, she will have kinetic energy at the bottom of the hill=45700 J

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