Physics

Problem

Three balls P, Q and R, each of mass

2\,\text{kg}

, are in the following situations: • P is at rest at a height of

5\,\text{m}

above the ground. • Q is moving horizontally at

4\,\text{m/s}

at a height of

3\,\text{m}

. • R is moving horizontally at

6\,\text{m/s}

on the ground level. Take

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

. a. (i) Calculate the total mechanical energy of each ball. b. (ii) Arrange the balls in decreasing order of their mechanical energy.