answer: no , mass plus magnet doesn't achieve the same height :here the explanations>>>
if we apply energy balance equation at both point i.e at h1 and h2
kinetic energy + potential energy remains same at both the points
here kinetic energy is 0 in both the cases because at h1 and h2 its reaches maximum height from where masses are free falling >only gravitational force is working there .
energy balance equation::
at h1 =at h2
m1gh1+[K.E =0] =(m1+m2)gh2 +[K.E=0]
h1/h2 =(m1+m2)/m1
clearly we can see that h1>h2
this this expeirment what kind of errors can occure anawer this questions Ss will pick up...