Question

An aeroplane touches the runway at 270 km/h and stops after a run of one kilometre. How long
s does it take to stop?
(26.67 s)

Answer 1

Answer:

26.67 s

Explanation:

The initial velocity of the plane as it touchs the run way is 270km/h=75m/s

u=75m/s

Finally it stops=v=0

It travels 1km to stop

s=1000m

v2-u2=2as

a=(75×75)/1000×2

=(75×75)/2000m/s2

v=u+at

t=(v-u)/a=(75–0)/{(75×75)/2000}

=75/{(75×75)/2000}

2000/75s=26.67s

Hope this would be helpful.