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A bullet of mass 20 g has an initial speed of 1 ms –1 , just before it starts penetrating a mud wall of thickness 20 cm. If the wall offers a mean resistance of 2.5 × 10 –2 N, the speed of the bullet after emerging from the other side of the wall is close to :

1. 0.3 ms –1
2. 0.1 ms –1
3. 0.7 ms –1
4. 0.4 ms –1

Correct answer: 0.7 ms –1

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