Physics

Problem

A ball of mass

0.2\,\text{kg}

is moving upward at a point

6\,\text{m}

above the ground with a speed of

5\,\text{m/s}

. Take

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

. The ground is first chosen as the zero of potential energy. If the reference level for potential energy is then shifted upward to pass through the ball’s position, what will be the numerical value of the ball’s total mechanical energy with respect to the new reference level? a)

14.5\,\text{J}

-12\,\text{J}

2.5\,\text{J}

12\,\text{J}

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