Answer:
Explanation:
Initial velocity (u) of the Bullet = 400 m/sec
Final velocity (v) of the Bullet = 100 m/sec
Bullet passed through the block in (t) = 0.0004 sec
Using 1st Equation of motion :
400 m/s = 100 m/s - a (0.0004)
<em>Deceleration of Bullet = 750,000 m/sec^2 </em>
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(a) F (force exerted by the wooden block on the bullet) = F (force exerted by the bullet on the wooden block)
F = m * a = 0.008 * 750,000<em> = </em>6000 N
(b) Using 3rd Equation of motion :
10000 = 160000 - 2 * 750,000 * S
Thickness of wood (S) = 0.1 m