Answer:
The kinetic energy is 20,000\ J
Step-by-step explanation:
The kinetic energy of a body is defined as:
[tex]k = \frac{1}{2}ms ^ 2[/tex]
Where m is the mass of the roller coaster car
s is the speed and k is the kinetic energy
We know that [tex]s = 20\ m/s[/tex]
[tex]m = 100\ kg[/tex]
Then the kinetic energy of the roller coaster car is:
[tex]k = \frac{1}{2}(100)(20) ^ 2\\\\k = 50(20) ^ 2\\\\k = 50 * 400\\\\k = 20,000\ J[/tex]
