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# A bullet travelling with a velocity of 16 m/s penetrates a tree trunk and comes to rest in 0.4 m. Find the time taken during the retardation. - Physics

Short Note

A bullet travelling with a velocity of 16 m/s penetrates a tree trunk and comes to rest in 0.4 m. Find the time taken during the retardation.

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#### Solution

Initial velocity, u = 16 m/s
Final velocity, v = 0
Distance, s = 0.4 m
Acceleration,

$a = \frac{v^2 - u^2}{2s}$
$\Rightarrow a = \frac{0 - {16}^2}{2 \times 0 . 4} = - 320 \text{ m } / s^2$

Time,

$t = \frac{v - u}{a}$
$\Rightarrow t = \frac{0 - 16}{- 320} = 0 . 05 \text{ s}$
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#### APPEARS IN

HC Verma Class 11, 12 Concepts of Physics 1
Chapter 3 Rest and Motion: Kinematics
Q 16 | Page 52
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