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Oblique Collision

A ball of mas...

Question

A ball of mass 3 kg collides with a wall with velocity $10 m / s e c$ at an angle of $30^{\circ}$ with the wall and after collision reflects at the same angle with the same speed. The change in momentum of ball in MKS unit is-

A

20

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B

30

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C

15

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D

45

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Solution

The correct option is C 30
$Δ p = 2 m v cos 60^{\circ} = m v = 2 \times 3 \times 10 \times \frac{1}{2} = 30 k g m / s$

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