a) We can find the kinetic energy from the formula:
KE=21mv2,KE=21⋅78000 kg⋅(864 hkm⋅1 km1000 m⋅1 h3600 s)2=2.25⋅109 J.
b) We can find the potential energy in relation to the ground from the formula:
PE=mgh,PE=78000 kg⋅9.8 s2m⋅11300 m=8.64⋅109 J.c) By the definition of the mechanical energy, we have:
E=PE+KE,E=8.64⋅109 J+2.25⋅109 J=1.09⋅1010 J.Answer:
a) KE=2.25⋅109 J.
b) PE=8.64⋅109 J.
c) E=1.09⋅1010 J.
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