Physics

Problem

Object

P

of mass

2\,\text{kg}

is placed on a balcony

15\,\text{m}

above the ground. Object

Q

of mass

5\,\text{kg}

rests on a platform in a pit

5\,\text{m}

below the same ground level. Taking ground level as the zero–potential reference and

g = 9.8\,\text{m/s}^2

, the total gravitational potential energy of the system consisting of

P

and

Q

is a)

-49\,\text{J}

539\,\text{J}

49\,\text{J}

50\,\text{J}