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How do you convert m/s^2 to km/h?
  • Thread starter Thread starter Kdawg
  • Start date Start date Sep 22, 2004
  • Tags Tags Convert
Click For Summary Converting m/s² to km/h directly is not possible since they measure different quantities: acceleration versus speed. To solve problems involving acceleration, it's essential to convert all units to SI units, specifically m/s for velocity. In a specific example, a bus traveling at 29 km/h accelerates at 3.7 m/s² for 6.3 seconds, requiring the initial speed to be converted to m/s before calculating the final velocity. The correct calculation involves ensuring proper unit conversion and applying the formula Vf = Vi + at accurately. Attention to unit conversion is crucial to avoid errors in calculations, as highlighted by past experiences in exams. Kdawg Messages 34 Reaction score 0 How do you convert m/s^2 to km/h? Physics news on Phys.org
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plover Homework Helper Messages 191 Reaction score 2 At least in the form you asked the question, you can't. m/s2 is a unit for acceleration while km/h is a unit for speed. KaneOris Messages 113 Reaction score 0 well you can if you have the delat t of a KaneOris Messages 113 Reaction score 0 But if you are trying to convert ms^-1 than its rather easy, there's a couple ways of doing it. I do it like such ((36km/60)/60)*1000 which is equal to 10ms^-1 Theres some really easy way to do it, but this one never fails and it doesn't take that much longer so i just use this one. Kdawg Messages 34 Reaction score 0 Oh, that would make sense wouldn't it, lol. I am trying to figure out this problem. A bus traveling at +29 km/h accelerates at a constant +3.7 m/s2 for 6.3 s. What is its final velocity in km/h? This is my work so far, what am I doing wrong. Vi = 29Km/h a = 3.7m/s^2 t = 6.3s Vf = ? Vf = Vi + at Vf = 29 + 3.7 * 6.3 Vf = 52 - With right sig figs plover Homework Helper Messages 191 Reaction score 2 Looks good to me. Kdawg Messages 34 Reaction score 0 Thats what I thought but the damn webassign keeps marking it wrong. KaneOris Messages 113 Reaction score 0 I can see why from here, Vf = Vi +at SI UNITS! Velocity SI unit is ms^-1 Therefore 29kmh^-1 Needs to be converted to ms^-1 KaneOris Messages 113 Reaction score 0 What is its final velocity in km/h? And then convert it back KaneOris Messages 113 Reaction score 0 You have to remember to convert stuff, i will never forget, i lost 15 marks out of 50 on my last exam from not converting to the SI units Kdawg Messages 34 Reaction score 0 I converted 29km/h to 8.0556m/s the multiplied 8.0556 + 3.7 * 6.3 = 30.6256 then converted that to 110. That obviously isn't right, what am I doing wrong. plover Homework Helper Messages 191 Reaction score 2 Bleah. Of course. I wasn't looking at the units. KaneOris Messages 113 Reaction score 0 Seems right to me... Remember, think of how long 6.3 seconds is when your accelerating in a car. Like when you go onto a freeway, you would really only accelerate for about 3 seconds to get to 100km, from about 50..., so 6 seconds is actually a long time to accelerate for tyco05 Messages 156 Reaction score 0
Kdawg said: I converted 29km/h to 8.0556m/s the multiplied 8.0556 + 3.7 * 6.3 = 30.6256 then converted that to 110. That obviously isn't right, what am I doing wrong.
Try evaluating this again I don't seem to get the same answer for 8.05556+(3.7*6.3) as you do. (and hence the converted figure is different as well) tyco05 Messages 156 Reaction score 0
KaneOris said: Seems right to me... Remember, think of how long 6.3 seconds is when your accelerating in a car. Like when you go onto a freeway, you would really only accelerate for about 3 seconds to get to 100km, from about 50..., so 6 seconds is actually a long time to accelerate for
This really depends on how hard you put your foot on the accelerator (or how good your car is!) KaneOris Messages 113 Reaction score 0 Yes, but you know what i mean, 6.3 seconds is a long time to accelerate, although the sound of it isn't very much, its a pain in the A$$ if you look at your watch and wait for 6 or 7 seconds to pass...

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