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If the braking distance of a medium sized car that is going at 50 miles per hour, it's braking disatnce is about 200 feet.

Does it take twice as far to stop a car that is going twice as fast? Explain. Thanks. Please help.

  

DragonSlayer554  Jul 15, 2014

Best Answer 

 #1
avatar+394 
+11

Energy is half the mass times the square of the velocity.

$$2^2=4$$ (This 2 represents the (doubling) increase in velocity)

Disregarding other considerations, it will take 4 times the distance.

 

 

7up

SevenUP  Jul 15, 2014
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3+0 Answers

 #1
avatar+394 
+11
Best Answer

Energy is half the mass times the square of the velocity.

$$2^2=4$$ (This 2 represents the (doubling) increase in velocity)

Disregarding other considerations, it will take 4 times the distance.

 

 

7up

SevenUP  Jul 15, 2014
 #2
avatar+8256 
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Thanks, 7UP. So, it is 4 times the distance for the car to come into a complete stop?

DragonSlayer554  Jul 15, 2014
 #3
avatar+3450 
+5

This is so funny, I learned this exact same thing is drivers ed. today.

"A car going twice the distance will take 4 times as long to stop"

NinjaDevo  Jul 16, 2014

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