An airplane is flying at +210m/s. It slows down to +165m/s in 12.3s. Find the acceleration of the airplane.
Is this right?: -3.65m/s squared
2006-12-14 22:20:15 · 9 answers · asked by ortheother 1 in Science & Mathematics ➔ Physics
By first law of kinematics:
v=u+a*t
Substituting u, v, t get a = -3.658536m/s^2
If you are assuming constant decceleration your answer is half correct.
Since significant digits in data is 3 your answer should be
-3.66m/s^2
2006-12-14 22:23:27 · answer #1 · answered by Som™ 6 · 0⤊ 0⤋
Some of these people are making it too complicated, I'm assuming you're just doing a Physics class homework. Well it should be -3.66 m/s² (that one number off will get your marked off) because the actual calculation is -3.658536585. The 8 in -3.658 rounds the 5 before it up to 6. You did great with significant digits, that's hard for many people :).
2006-12-15 00:07:24 · answer #2 · answered by Fräulein Jaclyn 2 · 0⤊ 0⤋
It's not bad. Formally you would expect some sort of direction for the speed so that you can give a direction for the acceleration too and so reinforce the idea that velocity and acceleration are vector quantities. As worded it's impossible to say what the acceleration really is and the answerer is forced to make a number of assumptions.
2006-12-14 23:09:58 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Yes
2006-12-14 22:27:21 · answer #4 · answered by vamsy 4 · 0⤊ 0⤋
No. Rounding error
2006-12-14 22:23:16 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Nope...rounding error
2006-12-14 23:17:46 · answer #6 · answered by ashwin_hariharan 3 · 0⤊ 0⤋
YES, although you must speak of average deceleration.
2006-12-14 22:25:15 · answer #7 · answered by Mr. X 2 · 0⤊ 0⤋
Looks like you did it correctly. Congrats !
2006-12-14 22:23:38 · answer #8 · answered by Gene 7 · 0⤊ 0⤋
Using v = u + at, yes it is -3.658 m/s sq
2006-12-14 22:31:07 · answer #9 · answered by Bharath 2 · 0⤊ 0⤋