Question

A jet plane lands with a speed of 100 m/s and can accelerate at a maximum rate of -5.00 m/s2 as it comes to a halt.

What is the minimum time it needs after it touches down before it comes to a rest?

Answer 1

20 seconds.

Step-by-step explanation:

A jet plane lands with a speed = 100 meter per seconds

After landing maximum acceleration (deceleration) exerted by the pilot to stop the plane = (-5) meter per seconds square

Final velocity of the plane = 0 m per s²

Equation used to calculate the minimum time to stop the plane before the plane comes to the rest,

v = u + at

where 'v' = final velocity

u = initial velocity

a = acceleration

By substituting the values in the equation,

0 = 100 + (-5)t

t =
`(100)/(5)`

t = 20 seconds

Therefore, plane will require 20 seconds to stop after the landing.