acceleration

[CyberCarsten]

I have a little problem with a fairly easy assignment...

A car is moving with the constant acceleration of 1,75 m/s^2.
How long will it take for the car to reach 50 km/h???
This should be so easy, but I keep getting the wrong answer....

[NoteMe]

Hmmm...if the car starts with the speed 0m/s then I guess this is the right answer....


v=v₀ + at

v/a = t

(50/3,6)/1,75 = t

t = 7,9365079365079365079365079365079


Is that correct?

[CyberCarsten]

Yep!
Thanks again

[NoteMe]

No problem...like to do physics...need to fresh it up every now and then...

[alkatran]

To remember, acceleration isn't m/s^2, it is

delta(m/s)/s
(The change of speed per second)

I spent a good week confused in physics trying to figure out where that 2 came from. And technicly speed isn/t m/s it's

delta(m)/s

so acceleration is

delta(delta(m)/s)/s

[CyberCarsten]

m/s/s is m/s^2

[alkatran]

No kidding
m*s^-2 is the same thing!

[da_silvy]

And technicly speed isn/t m/s it's

delta(m)/s

nah

that's velocity

and because they're just units, both are just ms^-1

the difference is that velocity is a vector, and speed is a scalar