A ball of mass is moving upward at a point above the ground with a speed of

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Work Energy and Power · Work Energy and Power

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}

(b)

-12\,\text{J}

(c)

2.5\,\text{J}

(d)

12\,\text{J}

Related theory

Mechanical Energy
Potential Energy
Conservation of energy; conservative and non-conservative forces
Work, Energy and Power
Conservation of energy
Gravitational potential energy
Work and Energy

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