A jet plane lands with a speed of 107.1 m/s
and accelerates at a rate of −5 m/s^2
as it
comes to rest.
From the instant the plane touches the runway, what is the time needed before it can
come to rest?
Answer in units of s

Question

A jet plane lands with a speed of 107.1 m/s
and accelerates at a rate of −5 m/s^2
as it
comes to rest.
From the instant the plane touches the runway, what is the time needed before it can
come to rest?
Answer in units of s

anonymous · Answer

$$v=u+at$$

v=0 Since the particle comes to rest

$$-u=at$$

$$-107.1 = -5t$$

$$t=21.42s$$