A car enters a tunnel that is 100 meters long with an initial speed of 20 m/s. If the car exits the tunnel at a speed of 30 m/s what was the average accelaration of the car while it was in the tunnel?
2006-09-13 09:26:59 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Physics
How long does it take to go through the tunnel?
avg speed in tunnel = (20 + 30)/2 = 25 m/s
25 m/s for 100 meters = 4 seconds.
Change in velocity = 10 m/s over 4 seconds = acceleration of 2.5 m/s^2
2006-09-13 09:31:05 · answer #1 · answered by DanE 7 · 2⤊ 0⤋
The average speed in the tunnel was 25 meters per second. The time spent in the tunnel is approximately four seconds (if the acceleration is uniform, the time is actually a bit more than that, but it takes calculus to figure it out), so the car increased its speed by 10 meters per second in four seconds, so the acceleration is 2.5 meters per second per second.
2006-09-13 09:36:46 · answer #2 · answered by Anonymous · 1⤊ 0⤋
Average velocity = (20+30)/2=25 m/s
to travel 100 m with speed 25m/s 100/25=4 sec
net velocity gain within 4 sec is 30-20=10m/s
so average acceleration is 10/4=2.5 m/s^2
2006-09-13 14:17:58 · answer #3 · answered by dwarf 3 · 0⤊ 0⤋
1 m/s every 10 meters
2006-09-13 09:29:30 · answer #4 · answered by james 2 · 1⤊ 0⤋
would have to know how many seconds it was in tunnel
2006-09-13 09:32:16 · answer #5 · answered by Anonymous · 0⤊ 0⤋
I'll guess 5 m/s, but it's probably a trick question, so you science people aren't really that clever anyway.
2006-09-13 09:35:03 · answer #6 · answered by Anonymous · 0⤊ 0⤋
nice try waldo. I'm not doing your word problem math for yah.
2006-09-13 09:28:27 · answer #7 · answered by Tones 6 · 0⤊ 0⤋
I Would Think 25m/s
2006-09-13 09:29:05 · answer #8 · answered by ? 3 · 0⤊ 0⤋
I don't know the question, but I know the answer.
2006-09-13 09:28:47 · answer #9 · answered by AnswerBot 4 · 0⤊ 0⤋
delta v over delta t
2006-09-13 09:29:27 · answer #10 · answered by bubsir 4 · 0⤊ 0⤋