A cinder block is sitting on a platform 20 m high. It weighs 79 N. The block has Gravitational Potential Energy.
Calculations:
Ep = mgh = mg = Fg
Ep = (Fg)(h)
Ep = (79N)(20 m)
Ep = 1580 J.
I believe the block's potential energy with respect to gravity is 1580 J.