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    a toy car of mass 0.05kg collides with a brick. just before it hits the brick, its speed is 3ms^-1. it rebounds at two thirds of its speed. the contact time is 0.2 s.

    a- calculate the change of momentum of the car in the impact.

    b- calculate the average force on the brick during the impact.
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    (Original post by nofronting)
    a toy car of mass 0.05kg collides with a brick. just before it hits the brick, its speed is 3ms^-1. it rebounds at two thirds of its speed. the contact time is 0.2 s.

    a- calculate the change of momentum of the car in the impact.

    b- calculate the average force on the brick during the impact.
    a)
    p before = mv = 0.15kg m/s
    p after = mv = -0.10kg m/s

    change in p = 0.25kg m/s

    b)

    f = dp/dt = 1.25N ->
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    (Original post by rts)
    a)
    p before = mv = 0.15kg m/s
    p after = mv = -0.10kg m/s

    change in p = 0.25kg m/s

    b)

    f = dp/dt = 1.25N ->
    Thanks
 
 
 
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