Question

multiple choice question 4 a mechanism in a mechanics lift failed, and a 1,000 kg car fell toward the ground at a constant 5 m/s. what is the kinetic energy of the car? a 2,500,000 j b 49,000 j c 12,500 j

Explanation:

Step1: Recall kinetic - energy formula

The formula for kinetic energy is $K = \frac{1}{2}mv^{2}$, where $m$ is the mass and $v$ is the velocity.

Step2: Identify given values

Given $m = 1000\ kg$ and $v = 5\ m/s$.

Step3: Substitute values into formula

$K=\frac{1}{2}\times1000\times(5)^{2}=\frac{1}{2}\times1000\times25 = 12500\ J$.

Answer:

C. 12,500 J