Help... another P6 problem...?

0 ⤊

Help... another P6 problem...?

a DC-8 airplane has a take-off velocity of 80km/hr which it reaches 35s after starting from rest. what is the manimum lenght of the runway? Pls.. show your solution...

2007-07-09 22:28:03 · 2 answers · asked by help_me7 1 in Science & Mathematics ➔ Physics

2 answers

1400m..

2007-07-11 23:09:28 · answer #1 · answered by ewan_jrj777 2 · 0⤊ 0⤋

v = 80/3.6 = 22.2 m/s
u = 0
a = (v-u)/t = 22.2 / 35 = 0.635 m/s^2

Then v^2 = u^2 + 2as => s = 22.2^2 / 2(0.635) = 390 m.

2007-07-10 05:34:22 · answer #2 · answered by Scarlet Manuka 7 · 0⤊ 0⤋