Which law describes what happens when two skaters push apart in a
rink? (Newton’s laws)

Newton's third law

Explanation:

Newton's Third Law of equal and opposite forces is very important when considering collisions between objects or propulsion. In these situations, all of the forces are internal, which means that for every force, there will be an equally sized force in the opposite direction. An example is two skaters out on the ice.

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