Answer to Question #175007 in Classical Mechanics for Mary Chumanni

Question

An airplane travels 280m down the runway before taking off. If it starts from rest, moves with constant acceleration, and becomes airborne in 8.0s, what is it’s speed in m/s when it takes off?

Answer 1

$$d=\dfrac{1}{2}(v_0+v_f)t,$$ $$v_f=\dfrac{2d}{t}=\dfrac{2\cdot280\ m}{8.0\ s}=70\ \dfrac{m}{s}.$$