What is the kinetic energy of a 2,000 kg car that is moving at 72 km/h?
KE = 1/2 mv^2
where KE is kinetic energey, m is mass, and v is velocity. Plug in and solve.
40000j
1.0368^10
To calculate the kinetic energy of an object, you need to use the formula:
Kinetic Energy (KE) = 0.5 * mass * velocity^2
In this case, the mass of the car is given as 2,000 kg, and the velocity is given as 72 km/h. However, we need to convert the velocity from km/h to m/s because the formula requires velocity to be in meters per second.
To convert km/h to m/s, you can use the following conversion factor:
1 km/h = 0.2778 m/s
Now, let's convert the velocity:
72 km/h * 0.2778 m/s = 20 m/s
Now we have both the mass and velocity in the correct units. Let's plug these values into the formula:
KE = 0.5 * 2,000 kg * (20 m/s)^2
Simplifying:
KE = 0.5 * 2,000 kg * 400 m^2/s^2
KE = 400,000 kg·m^2/s^2
Therefore, the kinetic energy of the 2,000 kg car moving at 72 km/h is 400,000 kilogram meters squared per second squared (kg·m^2/s^2).