Posted by **Jeremy ** 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 -
**Jeremy **, 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 -
**MathMate**, 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*10^{6} m/s

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

- Physics -
**Edward**, 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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