Question

An aeroplane accelerates from rest down a runway at 3 $m{s}^{-2}$ for 30 s until it finally lifts off the ground. Determine the distance travelled before the takeoff.

• A. 1350 m
• B. 1620 m
• C. 1700 m
• D. 1882 m

Answer 1

The correct option is A 1350 m

The second equation of motion is given as:
$s=ut+\frac{1}{2}a{t}^2$
However, u = 0 since the aeroplane starts from rest.
$\Rightarrow s=\frac{1}{2}a{t}^2=\frac{1}{2}\times 3\times {30}^2=1350m$