A boy is rolling a 
ball on the frictionless floor with the speed of 
. The ball gets deflected by anobstacle on the way. After deflection it moves with 
of its initial kinetic energy. What is the speed of the ball now?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
JEE Main 2021
Given 
Initial kinetic energy 
After deflection it moves with 
of 
Now, let the final speed be 
then
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