Some of the gases that contribute to global warming are trapped in permafrost. When permafrost melts, many of these gases are released into the atmosphere. This leads to an increase of the atmosphere’s temperature, which causes more permafrost to melt.

What type of feedback loop is this an example of?

A positive feedback loop

Explanation:

Climate change is a complex and unpredictable process involving feedback loops

A feedback loop is a process that helps to amplify or diminish certain changes within the process.

And when it amplifies, it's a positive feedback loop. Otherwise it's a negative feedback loops

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s