Question

a roller coaster car has a mass of 858 kg. it is moving along the track with a velocity of 31 m/s. what is the roller coaster cars kinetic energy? answer

Explanation:

Step1: Recall kinetic energy formula

$KE = \frac{1}{2}mv^2$

Step2: Substitute given values

$m=858\ \text{kg}, v=31\ \text{m/s}$
$KE = \frac{1}{2} \times 858 \times 31^2$

Step3: Calculate step-by-step

First compute $31^2 = 961$
Then $\frac{1}{2} \times 858 = 429$
Finally $429 \times 961 = 411129$

Answer:

411129 J