Four identical balls

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Four identical balls, each of mass

1\,\text{kg}

, are in the following states: P: height

1\,\text{m}

, speed

4\,\text{m/s}

Q: height

2\,\text{m}

, speed

0\,\text{m/s}

R: height

0\,\text{m}

, speed

6\,\text{m/s}

S: height

1.5\,\text{m}

, speed

3\,\text{m/s}

Take

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

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