Calculate the acceleration for the follwing:
Initial Velocity: 0km/hour
Final Velocity: 24kn/hour
Time:3 seconds
Can someone explain how to sove it? I got 480m/s^2
What i did was change the 3 seconds to hours( .05 )
And dividing 24 by .05.
My teacher got 28,000km/s^2 I dont know who is right, me or her? HELP?
2006-09-14 17:23:55 · 7 answers · asked by Francisco E 1 in Science & Mathematics ➔ Physics
yall are right my teacher got 28800m/s^2 thanks alot though.
my mistake was putting 3 seconds as .05hours!
2006-09-14 17:51:38 · update #1
This isn't that hard. If your teacher got 28,800 m/s^2 then it is wrong. The acceleration is just the speed change divided by the time, but you need the UNITS correct.
24km/hour / 3 seconds is 8 km/hour/second.
Multiply by 3600 seconds/hour and you get 28,800 km/hour^2 (not 28,800 km/s^2 and not 28,800 m/s^2!!!)
If you want seconds in the denominator, DIVIDE your 8 km/hour/second by 3600 seconds/hour and you get 0.00222 km/s^2 or 2.22 m/s^2.
2006-09-15 02:06:35 · answer #1 · answered by An electrical engineer 5 · 0⤊ 0⤋
U R TEACHER ISWRIGHT
accelaration=(final velocity V -initiall velocity U) / time taken T
here
V=24kn/hour
U=0kM/hour
T=3SEC=3/(60*60) HRS
SO A=24*3600/3
ACC=28800KM/S^2
2006-09-15 00:43:31 · answer #2 · answered by vizag 2 · 0⤊ 2⤋
You are way off. The previous answer is correct about 3 seconds is not equal to .05 hours.
3 seconds = .00083333 hours
(24 km/hr - 0 km/hr) / .0008333 hr = 28800 km/hr^2
So, if you truly copied your teacher's answer of 28000 km/s^2 then your teacher is way off too.
2006-09-15 00:39:45 · answer #3 · answered by something 3 · 1⤊ 0⤋
Acceleration is the change in speed with respect to time. I assume all has be in a standard unit, lenght is measure in meter and time is measure in second.
so.... here is your work around.
0 km / hr = 0 meter / s
24km / hr = 6.6667 meter / s
acceleration , A = (6.667-0) / 3 = 2.22 m/s-2 or 0.002 km/s-2
2006-09-15 01:23:18 · answer #4 · answered by Mr. Logic 3 · 0⤊ 1⤋
3 seconds is not .05 hours.
.05 hours is 3 minutes. Want to try it again?
2006-09-15 00:31:19 · answer #5 · answered by Jim H 3 · 0⤊ 0⤋
ur teacher is quite right
since 3 sec =3/(60*60)=1/1200hrs
now ,24/(1/1200)=24*1200 =28800km/hr^2
2006-09-15 00:45:37 · answer #6 · answered by riyarshi 1 · 0⤊ 1⤋
Please, don't try to use decimal hours, its bound to confuse you
ALWAYS work with seconds, and use the following for speed:
1 kph = 0.277777778 m / s
2006-09-15 01:02:27 · answer #7 · answered by Diego A 2 · 0⤊ 0⤋