An airplane lands with a velocity of 100m.s/1.The maximum rate at which it can slow down is 5,0m.s/2.What is the minimum time needed to come to rest, starting from when it first touches ground?
v = Vi + a t
0 = 100 - 5 t
t = 20 seconds
0 = 100 - 5 t
t = 20 seconds