solution:-
given data
mass of bead(m)=5kg
velocity of bead at point A (vA)=0m/s
velocity of bead at point B(VB)=8.64km/h =2.4m/s
figure is shown below
there is no loss of energy between point A and B because there are no friction present.
by applying energy conservation law
EA=EB
mgh1+21mvA2=mgh2+21mvB2
mgh1−mgh2=21mvB2−21mvA2
therefore change in height can be written as
(h1−h2)=2g1(vB2−vA2)
by putting the value of vA , vB and g
(h1−h2)=2×9.81(2.42−02)
(h1−h2)=0.29m
therefore change in height is 0.29m.
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