# Physics

posted by .

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 -

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

• Physics -

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 -

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

## Similar Questions

1. ### trigonometry

the radius of the tires of a car is 13 inches, and they are revolving at the rate of 506 revolutions per minute. how fast is the car traveling in miles per hour. A. 6.23pi mph B. 1.25pi mph C. 149.50pi mph D. 12.46pi mph
2. ### Algebra

The distance required for an emergency stop for a car varies directly as the square of the carâ€™s speed. A car traveling at 50 mph requires 140 feet to stop. What is the stopping distance for a car traveling at 30 mph?
3. ### Physics

How fast would a 9-g fly have to be traveling to slow a 1790-kg car traveling at 58 mph by 4 mph if the fly hit the car in a totally inelastic head-on collision?
4. ### physics

Consider 2 automobile accidents in which identical cars are driven into solid wall at 30 mph and 60 mph, respectively. compared to the car traveling 30 mph, the car 60 mph transfers what?
5. ### physics

Consider 2 automobile accidents in which identical cars are driven into solid wall at 30 mph and 60 mph, respectively. compared to the car traveling 30 mph, the car 60 mph transfers what?
6. ### Physics

Which results in a higher force of impact?
7. ### Physics

Which results in a higher force of impact?
8. ### math

Suppose that a certain municipality uses the equation y=3(x-50)+30 to determine the fine assessed a car which exceeds the 50 mph speed limit. Let x=speed of the car (in mph) and y=corresponding fine in dollars. a)What is the fine for …
9. ### physics

How fast would a 4-g fly have to be traveling to slow a 1890-kg car traveling at 51 mph by 6 mph if the fly hit the car in a totally inelastic head-on collision?
10. ### Physics

You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 45.0 mph. The cars locked bumpers and …

More Similar Questions