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

Correct answer: B. 0.05 Initial velocity, u = 16 m/s Final velocity, v = 0 m/s Distance covered, s = 0.4 m Using the equation of motion s = ((u + v)/(2))t : 0.4 = ((16 + 0)/(2))t 0.4 = 8t t = (0.4)/(8) = 0.05 s

Concepts Of Physics MCQ Edition [Volume 1]

Exam: Concepts Of Physics MCQ Edition [Volume 1]
Subject: Physics
Chapter: Rest and Motion Kinematics

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Rest and Motion Kinematics

A bullet travelling with a velocity of 16 m/s penetrates a tree...

A bullet travelling with a velocity of

16 \text{ m/s}

penetrates a tree trunk and comes to rest in

0.4 \text{ m}

. Determine the time taken during the retardation in seconds.

Options

A $0.10$
B $0.05$
C $0.025$
D $0.40$

Correct answer

B. $0.05$

Step-by-step solution

Initial velocity,

u = 16 \text{ m/s}

Final velocity,

v = 0 \text{ m/s}

Distance covered,

s = 0.4 \text{ m}

Using the equation of motion

s = \left(\dfrac{u + v}{2}\right)t

0.4 = \left(\dfrac{16 + 0}{2}\right)t

0.4 = 8t

t = \dfrac{0.4}{8} = 0.05 \text{ s}

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