Homework Help: physics

Posted by Anonymous on Friday, September 7, 2007 at 5:16pm.

A Cessna aircraft has a lift-off speed of 120 km/h.

(a)What minimum constant acceleration does this require if the aircraft is to be airborne after a take=off of 240m?

Work: 120 km/h-->33.3 m/s
(33.3 m/s)^2= (16.7 m/s)^2 + 2a(240 m)
a= 1.73 m/s^2
[What did I do wrong?]

(b)How long does it take the aircraft to be airborne?

Answer in back of book: (a) 2.32 m/s^2
(b) 14.4 s

physics - bobpursley, Friday, September 7, 2007 at 5:23pm
Why do you think it had a starting velocity? Most airplanes start at the end of the runway with zero velocity.
physics - Anonymous, Friday, September 7, 2007 at 5:39pm
how would I find part(b)?
- physics - Anonymous, Friday, September 7, 2007 at 6:00pm
  I got the right answer, but the calculation does not make sense.
  
  (240m)/(33.3 m/s) x 2 = 14.4s
physics (EXPLAIN) - Anonymous, Friday, September 7, 2007 at 6:01pm
why would you multiply by 2?
physics - bobpursley, Friday, September 7, 2007 at 6:24pm
Part 2.

time= distance/average velocity

or

vf= vi+ at at takeoff, solve for t.
33.3=0+2.32 t

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