# physics

posted by .

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 -

Why do you think it had a starting velocity? Most airplanes start at the end of the runway with zero velocity.

• physics -

how would I find part(b)?

• physics -

I got the right answer, but the calculation does not make sense.

(240m)/(33.3 m/s) x 2 = 14.4s

• physics (EXPLAIN) -

why would you multiply by 2?

• physics -

Part 2.

time= distance/average velocity

or

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

• physics -

I got the answer to Part A and B.

Part A. (33.3)^2-0(velocity initial) / 2(240) = a
1108.89/480 = 2.32 (rounded)

Part B. (240m)(33.3m/s) x 2 = 14.4

## Similar Questions

An aircraft has a take-off speed 180km/h and has length 250m from the start just before take-off a serious snag is detected in the engine and the aircraft failed to take-off. There is a wall at a distance 'd' = 230m ahead of the take-off …

An aircraft has a take-off speed 180km/h and length 250m from the start just before take-off a serious snag is detected in the engine and the aircraft failed to take-off. There is a wall at a distance 'd' = 230m ahead of the take-off …
3. ### Physics

An aircraft has a lift-off speed of 120 km/hr. What minimum constant accelerationdoes this require if the aircraft is to be airborn after a take-off run of 240 m?
4. ### Physics

A Jet has a liftoff speed of 160 km/hr. What minimum uniform acceleration does this require if the aircraft is to be airborne after a takeoff run of 300m?
5. ### Physics

A Cessna 150 aircraft has a lift-oﬀ speed of approximately 125 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-oﬀ run of 172 m?
6. ### physics

A Cessna aircraft has a lift-off speed of 120 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 265 m?
7. ### physics

An aircraft has a lift off speed of 130 km/h. What minimum uniform acceleration does this require if the aircraft is to be airborne after a takeoff run of 350 m?
8. ### Physics

A small aircraft requires a speed of 34.0 m/s in order to take off. What minimum constant acceleration does this require if the aircraft is to be airborne at the end of a 245. meter long runway?
9. ### Physics

A small aircraft requires a speed of 34.0 m/s in order to take off. What minimum constant acceleration does this require if the aircraft is to be airborne at the end of a 245. meter long runway?
10. ### Physics

A certain aircraft has a liftoff speed of 126 km/h. (a) What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of 244 m?

More Similar Questions