# Engineering Science

If anyone can help with my last assignment question please.

A car accelerates along a straight road with a uniform acceleration when it passes A it has a speed of 12m/s and when it passes B it has a speed of 32m/s. points A and B are 1100m apart. Determine the time taken to move from A to B.

David
21:25 Sat 23rd Jun 2012
 nescio using the equations v^2 = u^2 + 2as and v = u + at, where u=initial speed, v=final speed, a=acceleration, s = distance travelled and t=time and rearranging, you get t = 2s / (v+u) =2200/44 = 50 m 23:17 Sat 23rd Jun 2012 Go To Best Answer

21 to 27 of 27

 Sorry that should be "The rectangle represents the distance that would be travelled if the velocity remained at 12 m/s, and the TRIangle the distance travelled due to the increase in velocity over the time interval. " 13:05 Fri 29th Jun 2012 Given that the acceleration is constant think the easiest way to solve this in one step is to use s= (u+v)t /2. Rearranging this gives t= 2s/(u+v)= 2x1100/(12+32)= 2200/44=50 13:12 Fri 29th Jun 2012 Wow, that stretched some minds ;-) 13:19 Fri 29th Jun 2012 I agree with you entirely factor. I was just trying to point out to Ignoblius where the flaw in his argument lies. It's easy to see that he is wrong because his formula for the time difference does not depend on the initial velocity, but only on the difference between the initial and final velocities. So if the initial velocity were 1,000,000 m/s and the final velocity 1,000,020 he would get the same answer, which is obviously wrong!! 13:23 Fri 29th Jun 2012 Hi vascop- my post was in response to Ignoblius too 13:49 Fri 29th Jun 2012 Isaac must be spinning in his grave ! 22:49 Fri 29th Jun 2012 vascop-You're right, I see my mistake, the area representing distance traveled up to reaching A would precede TA on the graph. The integral is the thing and that covers the rectangle and triangle areas both. Damn, I've gotten rusty at this stuff! 00:47 Sat 30th Jun 2012

21 to 27 of 27

Related Questions

## Science & engineering

In science and engineering what one same five-letter word can precede 'valve', 'wire', 'rule', and resistance?

## Computer Science?

Is the computer science the same as robotic engineering, cuz whenever i type robotics in a search bar on a university website, it just comes up with computer science all the time, but cant seem to...

## Nobel Prize (or equivalent) given for Engineering

http://www.bbc.co.uk/...-environment-15756113 Will this bi-annual award put British companies in the forefront for design and innovation or will we lose out to more advanced industrial nations?...

## aerospace engineering

How hard can it be? I mean ... it's not rocket science....

## Astronaut Education

I know that you have to have one of the following: 1. Bachelor's Degree in Engineering 2. Bachelor's Degree in Biological Science 3. Bachelor's Degree in Physical Science 4. Bachelor's Degree in Maths...