Question

A bullet moving with a velocity of 2m/s penetrates a wooden block and comes to rest after traversing 4 cm inside it. What is retardation?

Answer 1

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• Initial velocity = 2 m/s

• Final velocity = 0 m / s

• Distance travelled = 4 cm = 0.04 m

Formula = v² - u² = 2as

$\implies$ 0² - 2² = 2 × a × 0.04

$\implies$- 4 = 0.08a

$\implies$a = - 4 / 0.08

$\implies$a = - 50

Answer 2

Answer:

Explanation:

Given,

u = 2m/s

v = 0

S = 4cm = 0.04m

We know that,

v² - u² = 2aS

Since v² is zero,

-u² = 2aS

-(2)² = 2 * 0.04 * a

Therefore,

a = $\frac{-4}{2 * 0.04}$

  = - 50 m/s²

Since acceleration is -50m/s², Retardation will be 50m/s²

I do so hope that this helps you.