Question

14. Determine the kinetic energy of a 1000-kg roller coaster car that is moving with a speed of

40.0 m/s.

Answer 1

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.

Answer 2

200,000 J

Step-by-step explanation:

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

`k = (1)/(2) m {v}^(2) \\`

m is the mass

v is the velocity

From the question we have

`k = (1)/(2) * 1000 * {40}^(2) \\ = 500 * 400`

We have the final answer as

200,000 J

Hope this helps you