20.3k views
4 votes
An aircraft, traveling northward, lands on a runway with a speed of 79 m/s. Once it touches down, it slows to 6.0 m/s over 785 m of runway. What is the average acceleration (magnitude and direction) of the plane during landing (in m/s2)? Take the positive direction to be northward.

1 Answer

3 votes

Answer:


-3.95m/s^2, South

Step-by-step explanation:

We are given that

Initial speed of aircraft,u=79 m/s

Final speed of aircraft,v=6 m/s

Distance,s=785 m


v^2-u^2=2as

Substitute the values


(6)^2-(79)^2=2a(785)


36-6241=1570a


-6205=1570a


a=-(6205)/(1570)=-3.95m/s^2

Where negative sign indicates that the direction of acceleration is opposite to direction of motion.

Therefore, the direction of acceleration is south.

User Alex Townsend
by
9.0k points

No related questions found