Ask Experts Questions for FREE Help !
Ask
    Kleinrock's Avatar
    Kleinrock Posts: 2, Reputation: 1
    New Member
     
    #1

    Apr 6, 2012, 03:19 AM
    Could you answer this question?
    A car moving at 100 km / hour, crashed into a concrete wall that doesn't move. How much time it takes to stop the car and how much its acceleration?

    Nb: I think this question is not exhaustive, but maybe you have another ideas?
    smoothy's Avatar
    smoothy Posts: 25,490, Reputation: 2853
    Uber Member
     
    #2

    Apr 6, 2012, 05:13 AM
    Trick question... the decelleration G-forces will vary greatly by the vehicle... I.E. it will be a far higher number for a car built in the 60's with a strong frame, vs. a car built las year with very effective crumple zones that reduce the deceleration g-forces at impact via controlled deformation.

    Unless there are assumptions being made for class... but in the real world what I said applies.
    Kleinrock's Avatar
    Kleinrock Posts: 2, Reputation: 1
    New Member
     
    #3

    Apr 6, 2012, 05:55 AM
    Oh, I'm sorry.
    I forgot to put something in the question. This is the complete question:

    A car moving at 100 km / hour, crashed into a concrete wall that doesn't move. How much time it takes to stop the car and how much its acceleration?
    (nb: Ignore the gravity force, air friction, and mass of the car.)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
    Expert
     
    #4

    Apr 9, 2012, 05:37 AM
    Kleinrock - as smoothy hinted, it's impossible to answer this question without additional data. We need to know how much of the car of the car is crushed on impact. Since you don't know either time or acceleration, then y must know distance in order to apply one of the standard equations of motion, viz:



    or

    .

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Three year old won't answer a question, he only repeats the question... any thoughts? [ 7 Answers ]

I have three children who have never had any learning troubles however I babysit 2 kids each day that seem to be a little socially awkward. The oldest (age 5 1/2) won't look me in the eye and can't follow a multi-step instruction. The younger (age 3) has never been able to answer a question I ask...

Physics question... with answer, yet I don't know how to get the answer. [ 2 Answers ]

In order to qualify for the finals in a racing event, a car must achieve an average speed of 270 Km/h on a track with a total length of 1410 m. If a particular car covers the first half of the track at an average speed of 232 km/h, what minimum average speed must it have in the second half of the...

Can you answer my question? [ 1 Answers ]

A boat leaves the shore and travels 25km east and then 10km,60 degree east of north .can you use the phytagorean theory in finding the boats resultant?

Help me answer this question. [ 1 Answers ]

-7x-3y=-24 7x+2y=23


View more questions Search