If two cars were travelling at 50mph at what speed do they crash?
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If two cars were travelling at 50mph at what speed do they crash?
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Additional Details
SOrry. This should make more sense.
If two cars were traveling in the opposite direction at 50mph what is the combined impact speed?
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Pete T
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Oh, probably about 80, because one driver surely will be paying attention and be doing some serious braking. |
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lordtup
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At the point of impact neither car is travelling so the correct answer is nil/mph.
The question really should be"if two cars travelling in opposite direction at 50 mph collide what is the combined impact speed"The answer then is 100 mph |
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square
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the obvious answer is 100mph ... |
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tex k
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100 mph |
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MichaelS
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Expanding on Vince's answer, force=mass x acceleration. If both vehicles were coasting at 50 mph at the time of impact, the resulting force would be zero, because acceleration = zero. Hard to believe, but true. The crash velocity would still be 100 mph. |
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mcperson2k
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100MPH |
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t w
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i would have to say 100 |
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Hayden
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lordtup seriuosly dude why would you even say that ....are you trying to annoy people but yeah what lordtup said |
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Vince M
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Forget all the vaguearies of "impact speed" the RELATIVE speed each car has to the other is 100 miles per hour.
This would be true if the cars were headed toward each other or away from each other.
However, IF they were to hit head on, at the MOMENT of first contact, the vehicles are STILL traveling at 100 mph. They don't reach ZERO mph until everything stops moving.
Gah! I hate when people compicate what is already very simple. "Crumple zone" indeed. What the heck does THAT have to do with the question? And the mass of each vehicle does not change the speed of the vehicle. |
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al t
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terminal velocity (get it?)..... |
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Dimo J
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To me, "combined impact speed" means the speed of the combined vehicles after the impact.
Assuming the cars are of equal mass they each have a 50 mph crash; both going from 50 mph to 0 mph in the length of their crumple zones. The combined impact speed is 0 mph.
If the cars are of unequal masses then we get into momentum; with the combined impact speed being momentum of the more massive car minus the momentum of the lighter car, the combined mass traveling in the direction that the more massive car was traveling at a speed dependent upon the two masses. Lets say the combined impact speed in 25 mph in the direction that the more massive car was traveling. The more massive car experiences a 25 mph crash, and the lighter car experiences a 75 mph crash.
Which is why I carried my young children in a 5,500 pound 1978 Ford LTD. |
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