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Physics - Rotation Question with Solution | TestHub

PhysicsRotationCollision in RotationEasy2 minPYQ_2020

PhysicsEasysingle choice

A big particle of mass $(3 + m) k g$ blasts into $3$ pieces, such that a particle of mass $1 k g$ moves along $x$ -axis, with velocity $2 m s^{- 1}$ and a particle of mass $2 k g$ moves with velocity $1 m s^{- 1}$ perpendicular to direction of $1 k g$ particle. If the third particle moves with velocity $\sqrt{2} m s^{- 1}$ , then $m$ is

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Answer:

Solution:

conservation of linear momentum

$0 = (1 \times 2 \hat{i}) + (2 \times 1 \hat{j}) + m \vec{v}$

$\Rightarrow m \vec{v} = - 2 \hat{i} - 2 \hat{j}$

$\Rightarrow m v = 2 \sqrt{2}$

$\Rightarrow$ $m (\sqrt{2}) = 2 \sqrt{2} m = 2 k g$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:RotationSubtopic:Collision in Rotation

⏱ 2mℹ️ Source: PYQ_2020

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