Question

calculate the kinetic energy of baseball - sized hail (0.200 kg) given it will fall towards earth with an average velocity of 39.3 m/s. 786 j 393 j 309 j 154 j

Explanation:

Step1: Recall kinetic energy formula

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

Step2: Substitute given values

Substitute $m=0.200\ \text{kg}$, $v=39.3\ \text{m/s}$ into the formula:
$KE = \frac{1}{2} \times 0.200\ \text{kg} \times (39.3\ \text{m/s})^2$

Step3: Calculate step-by-step

First compute $(39.3)^2 = 1544.49$, then:
$KE = \frac{1}{2} \times 0.200 \times 1544.49 = 0.100 \times 1544.49$

Answer:

154 J