Physics

Problem

2\,\text{kg}

brick lies on the ground. The floor of the first floor,

3\,\text{m}

above the ground, is taken as the zero–potential level. (Take

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

.) The gravitational potential energy of the brick with respect to this chosen level is a)

0\text{ J}

+60\text{ J}

-60\text{ J}

-30\text{ J}