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16 March, 12:14

A Roller Derby Exhibition recently came to town. They packed the gym for two

consecutive weekend nights at South's field house. On Saturday evening, the

68-kg Anna Mosity was moving at 17 m/s when she collided with 76-kg Sandra

Day O'Klobber who was moving forward at 12 m/s and directly in Anna's path.

Anna jumped onto Sandra's back and the two continued moving together at

the same speed. Determine their speed immediately after the collision.

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Answers (1)
  1. 16 March, 12:41
    0
    14.36m/s

    Explanation:

    From the law of conservation of linear momentum

    m1u1 + m2u2 = v (m1 + m2)

    68*17 + 76*12 = v (68+76)

    1156+912 = 144v

    2068 = 144v

    v = 2068/144

    =14.36 m/s
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