Question

an aeroplane touches down at a speed of 180kmh-1 and comes to rest after covering runway of 1km. the retardation and time in which it comes to rest is
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Answer 1

Answer:

2km. Calculate the acceleration and the time, in which it comes to rest.

Medium

Answer

inital v elocity (u)=216km/h

=60m/s

final velocity(v)=0m/s

displacement after covering a ranway of 2km

=2000m

using the formula,

v

2

−u

2

=2as

0−3600=2a(2000)

hance,

a=−0.9m/s

2

again,using the formula,

v−u=at

0−60=0.9t

hence,t is approximately 66.67sec.