parkerb2004 parkerb2004

09-04-2018
Physics

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A 20-kg rock sits atop a 30 meter cliff. How much potential energy does it have?

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09-04-2018

Gravitational potential energy ...

= (mass) x (acceleration of gravity) x (height)

= (20 kg) x (9.8 m/s²) x (30 m)

= (20 x 9.8 x 30) kg-m²/sec²

= 5,880 joules

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