A bullet strikes a uniform plank with a velocity 400 m/s and comes out with half the velocity. what would be the velocity if the plank were only half thick.
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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 √10 m/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 √10 m/s
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