A bullet weighing 10 g is fired with a velocity of 800 ms-1. After pa

1.	A bullet weighing 10 g is fired with a velocity of 800 ms-1. After passing through a mud wall 1 m wall thick, its velocity decreases to 100 ms-1. Find the average resistance offered by the mud wall.
Answer» Using F.s = \(\frac{1}{2}mv^2-\frac{1}{2}mu^2\) where m = 10 g = \(\frac{10}{1000}\)kg = 0.01 kg and v = 100 ms^-1 , u = 800 ms^-1 and s = 1 m, we get F = \(\frac{1}{2}\) × 0.01 × (100² − 800²) = −3150 N.

A bullet weighing 10 g is fired with a velocity of 800 ms-1. After passing through a mud wall 1 m wall thick, its velocity decreases to 100 ms-1. Find the average resistance offered by the mud wall.

Answer»

Using F.s = \(\frac{1}{2}mv^2-\frac{1}{2}mu^2\)

where m = 10 g = \(\frac{10}{1000}\)kg

= 0.01 kg

and v = 100 ms^-1 , u = 800 ms^-1

and s = 1 m,

we get F = \(\frac{1}{2}\) × 0.01 × (100² − 800²)

= −3150 N.

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A bullet weighing 10 g is fired with a velocity of 800 ms-1. After passing through a mud wall 1 m wall thick, its velocity decreases to 100 ms-1. Find the average resistance offered by the mud wall.

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