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Posted by on Wednesday, June 6, 2012 at 1:50pm.

How fast would a 9-g fly have to be traveling to slow a 1910-kg car traveling at 61 mph by 6 mph if the fly hit the car in a totally inelastic head-on collision?

Could someone explain the steps, please?

  • Physics - , Wednesday, June 6, 2012 at 1:51pm

    The answer is supposed to be 1.27e+06 mph, but I'm not sure how to solve for it.

  • Physics - , Wednesday, June 6, 2012 at 3:34pm

    Use conservation of momentum for inelastic collisions (when both masses travel at the same final speed in the same direction):

    m1u1+m2u2=(m1+m2)v

    Here
    m1=0.009 kg
    u1=to be found
    m2=1910 kg
    u2=61 mph

    (m1+m2)=1910.009
    v2=55 mph

    So
    0.009u1+1910*61 = (1910.009)(55)
    Solve for u1
    u1=(1910.009*55-1910*61)/0.009
    =-1.27*106 m/s

    The negative sign means the fly travels in the opposite direction to the car.

  • Physics - , Wednesday, November 7, 2012 at 11:36pm

    it wouldn't slow the car down at all its redundet there just isn't enough pressure behind the fly to stop the car or to slow it down it would kill the fly and make a speck of guts on the windshield

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