As a bus approaches a turn it goes from 30 m/s to 5 m/s in a space of 5 seconds. What was its acceleration?
2006-09-26 14:55:31 · 6 answers · asked by Helena 1 in Science & Mathematics ➔ Mathematics
MORE! MORE MORE! I NEED MORE ANSWERS PLEASE! AND MORE SIMPLER TO UNDERSTAND! HELP ME!
2006-09-26 14:56:33 · update #1
well, it has a speed change of 30m/s to 5 m/s over a 5 second period.
That would be -25m/s per 5 seconds.
Dividing it out, you get an average change of -5m/s/s.
Remember, this is only an average, and likely not a constant. (Especially in a real world situation)
2006-09-26 15:05:23 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The best advice I can give when working with these types of problems is to keep the units when you are doing the math. When you get an answer check to see if you have the right units. It's a fail safe way to make sure you did everything correct.
Example: You are trying to find the acceleration, which will be in the units of M/S^2. So let's do the math with the units.
Vi (Velocitry initial)= 30 M/s
Vf (Velocity final) = 5 M/s
T = 5 s
Since acceleration is the change in velocity over a period of time we first find the change in velocity (Vf-Vi).
5 M/s - 30 M/s = -25 M/s
We now divide the change in velocity by the time (T). We know to do this because the answer we need has s^2 on the bottom, right now it is only an s.
-25 M/s
---------- = -5 M/s^2
5 s
Our units of M/s^2 are correct, and the negative sign shows it is decellerating. These two checks prove that you are most likely correct in your answer.
2006-09-26 22:18:06 · answer #2 · answered by your_atlanta_man 2 · 0⤊ 0⤋
a=(v-u)/t
where a=acceleration
v=final velocity
u=initial velocity
t=time
therefore,
a=(5-30)/5
a= -5 m/s^2
r (retardation)= 5 m/s^2
2006-09-26 22:04:27 · answer #3 · answered by TUSHAR C 1 · 0⤊ 0⤋
omg, do u even try answering ur questions?
ur questions are too easy!!!!!!!!!!!!
but since ur a girl, il answer this one, lol
ur initial velocity is 30 m/s
ur final velocity is 5 m/s
time = 5 secs
a = v*t
but v = v(final) - v(initial)
so a = (v(final) - v(initial))/time
= (5 - 30)/5
= -25/5
= -5 m/s^2
did u get that?
too easy bb
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haha
2006-09-26 22:05:34 · answer #4 · answered by Anonymous · 0⤊ 1⤋
See my explanation at the reference below.
2006-09-26 22:11:48 · answer #5 · answered by ? 6 · 0⤊ 0⤋
5m/s/s if i can remember correctly.
2006-09-26 21:58:27 · answer #6 · answered by Yahoo! Answerer 6 · 0⤊ 0⤋