Question

An aircraft has a lift-off of $120km/h$. What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of $240m$? (in $m/s^2$)

• A. $2.2$
  
• B. $2.3$
  
• C. $2.4$
  
• D. $2.5$
  

Answer 1

The correct option is B $2.3$

Here, initial velocity of aircraft is $u=0m/s$.

Final velocity is $v=120km/hr=\frac{120\times 1000}{3600}=33.33m/s$

Traveled distance is $d=240m$

If $a$ be the required acceleration.

Using $v^2-u^2=2ad$,

$(33.33{)}^2-0^2=2a(240)$

$⟹$ $a=2.3m/s^2$