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Standard XII

Physics

Addition and Subtraction in Unit Vector Notation

An object of ...

Question

An object of m kg with speed of v m/s strikes a wall at an angle q and rebounds at the same speed and same angle. The magnitude of the change in momentum of the object will be

$2 m v c o s θ$

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$2 m v s i n θ$

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$0$

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$2 m v$

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Solution

The correct option is A
$2 m v c o s θ$

${\to P}_{1} = m v s i n θ^i - m v c o s θ^j$

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An object of m kg with speed of v m/s strikes a wall at an angle q and rebounds at the same speed and same angle. The magnitude of the change in momentum of the object will be

The correct option is A 2mv cosθ →P1=mv sinθ^i−mv cosθ^j

The correct option is A
$2 m v c o s θ$

${\to P}_{1} = m v s i n θ^i - m v c o s θ^j$