oubaas
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U = mgh = 20*0.453*9.8* 0.305*6 = 162.5 joule
A
potential energy possessed by a body is on account of its position or configuration. So,
PE = mass*acceleration due to gravity*height = 20*32.2*6 (avg value of g = 9.81 m/s^2 = 32.2 ft/s^2)
PE=3864 lb-ft^2/sec^2
billrussell42
20 lb = 9.07 kg
6 ft = 1.83 meters
PE = mgh = (9.07)(9.8)(1.83) Joules