Question

An airliner reaches its takeoff speed of $163mph$ in $36.2s$. What is the magnitude of its average acceleration. (in $m/s^2$)

• A. $3$
  
• B. $2$
  
• C. $1$
  
• D. $4$
  

Answer 1

Answer: (B)

$2$

The acceleration is the ratio of change of velocity and the traveled time

Change of velocity$=163mph$

$=0.447\times 163㎧$

$=72.9㎧$

The traveled time is $36.2sec$

Then the average acceleration

$a=\frac{72.9}{36.2}=2㎨$