Question

An airplane must reach a take of speed of $80m/s$ in a $1000m$ long runway. What minimum constant acceleration is required? (in $m/s^2$)

• A. $3.2$
  
• B. $2.2$
  
• C. $1$
  
• D. $4$
  

Answer 1

The correct option is A $3.2$

Here, initial velocity is $u=0m/s$ (as airplane starts from rest)

Final velocity is $v=80m/s$ and distance traveled, $S=1000m$.

Let $a$ be the required acceleration.

Using formula $v^2-u^2=2aS$,

$(80{)}^2-0^2=2a(1000)$

So, we get $a=3.2m/s^2$