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progtommlp Micro Wave USA 145 Posts	Posted - 09/25/2002 : 03:01:39 Could anyone please help? 5. A truck accelerated uniformly from 30mph to 60mph in 10 seconds. What was its average velocity during this time? And what is the average acceleration of the truck? 7. A rocket sled acclerates uniformly from rest to 50m/s in 5 seconds. How far does it go during that time? Questions 8, 9, 10 are about a car that slows down from 30m/s at a rate of 1.5 m/s/s. 8. What is the velocity of the car at the end of 8 seconds? 9. What is the average velocity of the car over the 8 second time interval? 10. How far does the car travel during the 8 seconds? Please respond as quickly as possible. I'm on AIM(progtommlp). PLEASE RESPOND!! Alert Mentor now
schwartzchildradius999 X-Ray Wave USA 1858 Posts	Posted - 09/25/2002 : 08:10:54 quote: A truck accelerated uniformly from 30mph to 60mph in 10 seconds. What was its average velocity during this time? And what is the average acceleration of the truck? to get an average you take n data points, add them, and divide by the number of data points. You know this? good. You have two data points. v1 = 30 v2 = 60 v1 + v2 / 2 = ? The acceleration is the change in velocity divided by the change in time. v2 - v1 / time in your case, time = 10 seconds. quote: 7. A rocket sled acclerates uniformly from rest to 50m/s in 5 seconds. How far does it go during that time? I had a car once that I called the 'rocket sled.' It was a 1972 Toronado - awesome machine. 455 cubic inch engine, front wheel drive, 19 feet long. anyway, to find this solve this differential equation: a = dv/dt adt = dv at = v (initial conditions zero) at = dx/dt atdt = dx at²/2=x (initial conditions zero) 8,9,and 10 sould be solvable from the above equations also. "The sun is the same in a relative way, but you're older" --Pink floyd Time Alert Mentor now

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