Physics

Problem

Four identical balls, each of mass

1\,\text{kg}

, are in the following states:\nP: height

1\,\text{m}

, speed

4\,\text{m/s}

\nQ: height

2\,\text{m}

, speed

0\,\text{m/s}

\nR: height

0\,\text{m}

, speed

6\,\text{m/s}

\nS: height

1.5\,\text{m}

, speed

3\,\text{m/s}

\nTake

g = 10\,\text{m/s}^2

. Which two balls have equal total mechanical energy? a) R and S b) Q and S c) P and R d) Q and R