PE is the potential energy of the object. KE isthe kinetic energy of the object.

Question

PE is the potential energy of the object. KE isthe kinetic energy of the object. The total initial energy at rest is: E_initial = PE_1 The total final energy when it contacts the ground is: Efinal = KE_f Assuming no losses, the energy conservation law says the initial and final energies must be the same. Therefore: E_initial = E_final The joule (J) is a unit of energy and can be expressed as kg.m/s^2 Conversion factors: 12 inches = 1 foot, 2.54 cm = 1 inch Show your work when converting units. Use the correct number of significant figures in your final answers If you are told the height h is 28.5 feet, what is the initial energy E_initial (in J) of the object

Explanation / Answer

a)

Einitia = PE = mxgxh

h = 28.5 ft = 8.6868 m

m= 8.003 kg

Einitial = 681.9957 J

b)

Einitial = E final

mgh = 0.5mV2

V = sqrt (2gh)

V = 13.055 m/sec

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