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Math Help - momentum

  1. #1
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    momentum

    Two railway trucks, A and B with masses 7m kg and 3m kg respectively, are travelling towards each other on a smooth horizonatl track.
    Both trucks are travelling at 3m/s when they collide.
    The trucks couple together in the collision and then move together as a single body
    i)find the velocity opf the combined trucks immediately after the collision
    ii)find in terms of m the magnitude of the impulse A ON B in the collision

    Immediately after the collision the truck experiences a braking force which brings them to rest in 24metres.
    ii)fidn the magnitude of the braking force.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by helpishere View Post
    Two railway trucks, A and B with masses 7m kg and 3m kg respectively, are travelling towards each other on a smooth horizonatl track.
    Both trucks are travelling at 3m/s when they collide.
    The trucks couple together in the collision and then move together as a single body
    i)find the velocity opf the combined trucks immediately after the collision
    Conservation of linear momentum!

    Before collision momentum is 21m-9m kg.m/s. After collision the momentum is 10m v kg.m/s, so:

    30m = 10m v

    so v=3 m/s in the same direction as the original motion of the heavier truck

    ii)find in terms of m the magnitude of the impulse A ON B in the collision
    The impulse on B is equal to its change in momentum

    Immediately after the collision the truck experiences a braking force which brings them to rest in 24metres.
    ii)fidn the magnitude of the braking force.
    You should be able to do this, you know the initial velocity, assume a constant breaking force.

    RonL
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