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PhysicsNLMMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

A bullet of mass $20 g$ has an initial speed of $1 m s^{- 1}$ , just before it starts penetrating a mud wall of thickness $20 c m$ . If the wall offers a mean resistance of $2.5 \times 10^{- 2} N,$ the speed of the bullet after emerging from the other side of the wall is close to:

Options:

Answer:

Solution:

$a = - \frac{2.5 \times 10^{- 2}}{20 \times 10^{- 3}} = - \frac{5}{4} m s^{- 2}$
From $v^{2} - u^{2} = 2 a s$
$v^{2} = u^{2} + 2 a s$
$v = \sqrt{1^{2} - 2 \times \frac{5}{4} \times 20 \times 10^{- 2}}$
$= \sqrt{0.5}$
$= 0.7 m s^{- 1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:NLMSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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