Posted by Zikhona on .
An airplane lands with a velocity of 100 m.s. The maximum rate at which it can slow down is 5,0 m.s
1. What is the minimum time needed to come to rest, starting from when it first touches the ground?
2. Can this plane safely land at a small airport where the landing strip is 0,80 km long?

Maths,Physics,life science,geography, 
Damon,
I assume you mean Vi = 100 m/s and a = 5 m/s^2
v = Vi + a t
0 = 100 5 t
t = 20 seconds
to go from 100 to 0 at 5m/s^2
d = Vi (20)  (1/2)(5)(20)^2
d = 100 (20)  2.5(400)
= 2000  1000
= 1000 meters to stop, runs 200 meters beyond the end of the runway into the harbor where he strikes a passenger ferry.