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7 November, 01:46

A plastic ball of mass 0.200 kg moves with a velocity of 0.30 m/s. This plastic ball collides with a second plastic ball of mass 0.100 kg that is moving along the same line at a velocity of 0.10 m/s. After the collision, the velocity of the 0.100 kg ball is 0.36 m/s. What is the velocity of the second ball?

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  1. 7 November, 02:06
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    Velocity of 0.2 kg ball is 0.17 m/s

    Explanation:

    Let the mass of balls be m and M.

    Initial velocity ball 1 be u₁, ball 2 be u₂

    Final velocity ball 1 be v₁, ball 2 be v₂

    Initial momentum = m x u₁ + M x u₂ = 0.2 x 0.3 + 0.1 x 0.1 = 0.07 kgm/s

    Final momentum = m x v₁ + M x v₂ = 0.2 x v₁ + 0.1 x 0.36 = 0.2v₁ + 0.036

    We have momentum conservation

    Initial momentum = Final momentum

    0.07 = 0.2v₁ + 0.036

    v₁ = 0.17 m/s

    Velocity of 0.2 kg ball is 0.17 m/s
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