In a ballistics demonstration a police officer fires a bullet of mass 50 g with speed 
on soft plywood of thickness 2 cm. The bullet emerges with only 10% of its initial kinetic energy. The emergent speed of the bullet is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
: Here, 
Initial kinetic energy of the bullet is
Final kinetic energy of the bullet is
Let 
be the emergent speed of the bullet. Then
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