Hydrogens on the same carbon (geminal) atom which is double bonded to the adjacent carbon atom are in different electronic environment, and thus are non-equivalent and have different resonance frequences.
Ha is cis to the ethyl group , while Hb is trans to the ethyl group.
Yes, there will be 5 signals in proton NMR spectrum as each of Ha and Hb will give a signal:
NMR spectrum can be found on the link: http://atb.uq.edu.au/molecule.py?molid=31858#panel-nmr
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