Question

A bullet strikes on a plank with a velocity of 400 m/s and comes out with half the velocity.what would be the velocity,if the plank where only half thick.

Answer 1

Answer:

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