Question

an aeroplane lands at 216km/hr and stops after covering runway of 2km calculate its acceleration and the time in which comes to rest

Answer 1

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Answer 2

Explanation :

It is given that,

Initial velocity of an Aeroplane, u = 216 km/h = 60 m/s

It stops and then final velocity, v = 0

Distance covered, s = 2 Km = 2000 m

Using third equation of motion :

$v^2-u^2=2as$

$0-(60\ m/s)^2=2a\times 2000\ m$

$a=-0.9\ m/s^2$

Again using first equation of motion :

$v=u+at$

$0=60\ m/s-0.9\ m/s^2t$

$t=66.67\ s$

Hence, this is the required solution.