Question

A jet plane lands with a speed of 96 m/s and can accelerate at a maximum rate of −4.10 m/s2 as it comes to rest.(a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest?________ s

Answer 1

We have:

Vo = initial velocity = 96 m/s

a = acceleration = -4.10 m/s^2

Vf = final velocity = 0 m/s (rest)

t= time = ?

Apply:

vf = vo + at

Isolate t:

t = vf - vo / a

Replacing:

t = [ 0 - 96 ] / -4.10

t = 23.4 s