A20kg rock is on the edge of a 100m cliff. what gravitational energy does the rock process relative to the base of the cliff

Gravitational potential energy = (mass) x (gravity) x (height above the reference)

                                           = (20 kg) x (9.8 m/s²) x (100 m)

                                           =  (20 x 9.8 x 100)  kg-m²/s²

                                           =     19,600 joules  .  

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