A bullet enters a plank of 30 mm thickness with a velocity of 100 m/s and emerges out from the plank with a velocity of 50 m/s. What is the minimum thickness of the plank so that the bullet remain embedded in the plank:

A bullet enters a plank of 30 mm thickness with a velocity of 100 m/s

1.	A bullet enters a plank of 30 mm thickness with a velocity of 100 m/s and emerges out from the plank with a velocity of 50 m/s. What is the minimum thickness of the plank so that the bullet remain embedded in the plank:
A.	100 mm
B.	80 mm
C.	60 mm
D.	40 mm
Answer» D. 40 mm

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A bullet enters a plank of 30 mm thickness with a velocity of 100 m/s and emerges out from the plank with a velocity of 50 m/s. What is the minimum thickness of the plank so that the bullet remain embedded in the plank:

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