Question

3 which ball has more kinetic energy? explain.

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. Assume both balls have the same velocity (since no information about velocity difference is given).

Step2: Compare masses

The first ball has a mass $m_1=3$ kg and the second ball has a mass $m_2 = 6$ kg. Since $K\propto m$ when $v$ is constant, and $m_2>m_1$.

Answer:

The 6 - kg ball has more kinetic energy because, assuming the same velocity for both balls, kinetic energy is directly proportional to mass according to the formula $K=\frac{1}{2}mv^{2}$, and the 6 - kg ball has a greater mass than the 3 - kg ball.