Question

# An aircraft, initially stationary on a runway, takes off with a speed of $$85$$km $$h^{-1}$$ in a distance of no more than $$1.20$$km.What is the minimum constant acceleration  necessary for the aircraft?

A
0.23ms2
B
0.46ms2
C
3.0ms2
D
6.0ms2

Solution

## The correct option is A $$0.23 ms^{-2}$$Using equation of motion $$v^2-u^2=2as$$, where $$u=0,\ v=85kmh^{-1}=23.6m/s$$$$\Rightarrow 23.6\times23.6=2\times a\times1200$$$$\Rightarrow a=\dfrac {23.6\times23.6}{2\times1200}=0.23ms^{-2}$$Physics

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