You see a leaf falling to the ground with constant speed. When you first notice it, the leaf has initial total energy PEi + KEi. You watch the leaf until just before it hits the ground, at which point it has final total energy PEf + KEf. How do these total energies compare?
a) PEi + KEi > PEf + KEf
b) PEi + KEi = PEf + KEf
c) PEi + KEi < PEf + KEf
d) impossible to tell from the information provided
Ans: a) PEi + KEi > PEf + KEf
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