A bullet strikes a uniform plank with a velocity of 400 m/s and comes out with half velocity. What would be the velocity if the plank were only half thick?

Thickness = s

deceleration of the bullet inside plank = -a

200² - 400² = -2 a s

a S = 60,000 units

v² - 400² = 2* a*s/2

v² = 160,000 - 60,000 = 100,000 units

v = 100√10m/s

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