What is the energy of the 30 kg skateboarder at 2 m off the ground traveling at 3 m/s?

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moniques3370 moniques3370

06-04-2021
Physics

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What is the energy of the 30 kg skateboarder at 2 m off the ground traveling at 3 m/s?

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cz28edmx5a cz28edmx5a · Answer 1 · 2021-04-06T19:33:05+02:00

1) The kinetic energy of an object is given by:

where m is the object's mass and v its speed.

By using this equation, we find the initial kinetic energy of the skateboarder:

and the final kinetic energy as well:

So, her change in kinetic energy is

2) The work-energy theorem states that the work done to increase the speed of an object is equal to the variation of kinetic energy of the object:

Therefore, the work done by the skateboarder is