In a ballistics demonstration, a police officer fires a bullet of mass 50.0 g with speed 200 m s –1 on soft plywood of thickness 2.00 cm. The bullet emerges with only 10% of its initial kinetic energy. What is the emergent speed of the bullet?
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(v f = 
= 63.2 ms –1 )
Sol. K f = 0.1 K i
⇒ 
mv 2 = 0.1 × 
mu 2 ⇒ v
2 = 0.1 × (200) 2
⇒ v = 
m/s.
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