Respuesta :

Stephen46

Answer:

200,000 J

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 1000 \times {40}^{2} \\ = 500 \times 400[/tex]

We have the final answer as

200,000 J

Hope this helps you

ChizuruChan

Hello!!

Sorry to contradict the before answer, but he's wrong.

The formula is correct:

k = 1/2 * mv²

If we replace it with our data:

k = 1/2 * (1000 kg) (40 m/s)²

Here is the problem, 40^2 is = 1600, so the result is wrong:

k = 500 Kg * 1600 m²/s²

And if we resolve it:

k = 800 000 Joules

Then the kinetic energy of the roller coaster car is 800 000 Joules.

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