a bullet hits a wall with a velocity of 20m/s and penetrates it up to a distance of 5 cm.Find the deceleration of the bullet in the wall.

a bullet hits a wall with a velocity of 20m/s and penetrates it up to

1.	a bullet hits a wall with a velocity of 20m/s and penetrates it up to a distance of 5 cm.Find the deceleration of the bullet in the wall.
Answer» Given, initial velocity (u) = 20m/s Final velocity (v) = 0. ( As bullet come to rest after striking to wall ) Distance TRAVELLED (S) = 5cm = 0.05m Now, Using third equation of motion, v² = u² + 2as 0 = 20² + 2× 0.05 *a a = -400/0.1 a = -4000m/sec² Note:- NEGATIVE SINGS shows that BODY has a retardation and its SPEED is decreasing.

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a bullet hits a wall with a velocity of 20m/s and penetrates it up to a distance of 5 cm.Find the deceleration of the bullet in the wall.

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