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Misha Larkins [42]
2 years ago
5

A skateboarder initially has 5 kJ of kinetic energy. As she freewheels along a flat section of path, she does 400 J of work agai

nst friction and air resistance. Calculate her final kinetic energy.​
Physics
1 answer:
sweet [91]2 years ago
4 0

The final kinetic energy of the skateboarder after she freewheels and did work against friction on the flat section of the path is 4,600 J.

<h3>Conservation of energy</h3>

The final kinetic energy of the stakeboarder is determined by applying the principle of conservation of energy as shown below;

ΔK.E = -W

K.Ef - K.Ei = -W

where;

  • K.Ef is the final kinetic energy
  • K.Ei is the initial kinetic energy
  • W is work done

K.Ef = K.Ei - W

K.Ef = 5,000 J - 400 J

K.Ef = 4,600 J

Thus, the final kinetic energy of the skateboarder is 4,600 J.

Learn more about kinetic energy here: brainly.com/question/25959744

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Alan leaves Los Angeles at 8:00 a.m. to drive to San Francisco, 400 mi away. He travels at a steady 46.0 mph . Beth leaves Los A
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Answer:

25 min, 48 sec

Explanation:

Alan:

t = d/v

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So it took Alan 8.70 hrs; from 8 am, that's 4:42 pm that he arrives.

t = d/v

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So it took Beth 7.27 hrs; from 9 am, that's 4:16:12 that she arrives.

4:42 - 4:16:12 = 25.8 minutes = 25 minutes, 48 sec

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Answer:

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