Ans ITT lalal

Co-efficient of Restitution is defined as :-
e equals fraction numerator V e l o c i t y space o f space S e p a r a t i o n over denominator V e l o c i t y space o f space A p p r o a c h end fraction
Velocity of ball when strike the ground first time from height h will be v1=2gH, this will be velocity of approach.
 And after rebound lets its velocity be v2, this will be velocity of separation.
With v2, it gains 80% of initial height which is 80H100=4H5
v2 = 2g4H5=8gH5
  e=v2v1=8gH52gh=45
Option C
Regards .


 

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