Question

A jet plane lands with a speed of 100 m/s and can accelerate at a maximum rate of -5.00 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? (b) Can this plane land on a small tropical island airport where the runway is 0.800 km long?

Answer 1

a.

use the first equation of motion

Answer 2

v = u + at correct?

Answer 3

yes

Answer 4

I came up with -20 seconds

Answer 5

nah, +20 seconds

Answer 6

Ok just had to change the sign.

Answer 7

cool