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The problem presents an electric motorcycle, where the total electric energy is given as 800 J. Some of this energy is lost to friction (200 J) and heat (200 J). The question asks how much energy is converted into kinetic energy.

We can solve this using the principle of energy conservation. The total energy is distributed between kinetic energy, heat, and friction.

The equation to use is:
\[
\text{Electric Energy} = \text{Kinetic Energy} + \text{Heat Energy} + \text{Friction Energy}
\]
Substituting the values:
\[
800 \, \text{J} = \text{Kinetic Energy} + 200 \, \text{J} + 200 \, \text{J}
\]
\[
800 \, \text{J} = \text{Kinetic Energy} + 400 \, \text{J}
\]
Solving for the kinetic energy:
\[
\text{Kinetic Energy} = 800 \, \text{J} - 400 \, \text{J} = 400 \, \text{J}
\]

Thus, **400 J** of energy goes toward kinetic energy. The correct answer is 400 J.

Would you like any further explanation or details on this?

### Related Questions:
1. What law explains the distribution of energy in this scenario?
2. How would the kinetic energy change if the friction energy increased to 300 J?
3. What is the efficiency of the motorcycle in converting electrical energy to kinetic energy?
4. Can kinetic energy exceed the total electric energy input in this case? Why or why not?
5. How does the energy loss to heat and friction impact the overall performance of the motorcycle?

#### Tip:
Always account for all energy losses (like friction and heat) when calculating net useful energy, especially in physics problems involving conservation of energy.

A famous motorcycle company has just built its first electric model. Like all vehicles, the purpose of the motorcycle is to put out kinetic energy. Given that the electric energy is 800 J, friction is 200 J, and heat is 200 J, how much energy goes toward kinetic energy?

Learn how to apply energy conservation principles to calculate kinetic energy in an electric motorcycle. The problem involves calculating how much of the total 800 J electric energy is converted into kinetic energy after accounting for 200 J of friction and 200 J of heat.

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