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9 June, 23:53

Two hockey pucks with mass 0.1 kg slide across the ice and collide. Before the collision, puck 1 is going 13 m/s to the east and puck 2 is going 18 m/s to the west. After the collision, puck 1 is going 18 m/s to the west. What is the velocity of puck 2?

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  1. 10 June, 02:20
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    According to the law of conservation of momentum,

    m1u1 + m2u2 = m1v1 + m2v2

    0.1 x 13 + 0.1 x 18 = 0.1 x 18 + 0.1 x v2

    v2 = 13 m/s

    the velocity of puck 2 is 13 m/s
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